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v2.4.1.9

Parent Company Statement of Income (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Income |  |  |  |  |  |  |  |  | $ 219.0 us-gaap_OtherIncome | $ 230.2 us-gaap_OtherIncome | $ 227.9 us-gaap_OtherIncome
Total Revenue | 2,635.7 us-gaap_Revenues | 2,609.4 us-gaap_Revenues | 2,653.5 us-gaap_Revenues | 2,611.1 us-gaap_Revenues | 2,586.2 us-gaap_Revenues | 2,540.9 us-gaap_Revenues | 2,601.9 us-gaap_Revenues | 2,624.8 us-gaap_Revenues | 10,509.7 us-gaap_Revenues | 10,353.8 us-gaap_Revenues | 10,515.4 us-gaap_Revenues
Income Before Income Tax | (457.9)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 312.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 346.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 326.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 305.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 284.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 311.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 303.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 527.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,205.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,249.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 113.8 us-gaap_IncomeTaxExpenseBenefit | 347.1 us-gaap_IncomeTaxExpenseBenefit | 355.1 us-gaap_IncomeTaxExpenseBenefit
Net Income | (279.1)us-gaap_NetIncomeLoss | 221.1 us-gaap_NetIncomeLoss | 242.5 us-gaap_NetIncomeLoss | 228.9 us-gaap_NetIncomeLoss | 221.2 us-gaap_NetIncomeLoss | 205.7 us-gaap_NetIncomeLoss | 218.6 us-gaap_NetIncomeLoss | 212.6 us-gaap_NetIncomeLoss | 413.4 us-gaap_NetIncomeLoss | 858.1 us-gaap_NetIncomeLoss | 894.4 us-gaap_NetIncomeLoss
Total Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | (88.6)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (373.0)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 166.2 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive Income |  |  |  |  |  |  |  |  | 324.8 us-gaap_ComprehensiveIncomeNetOfTax | 485.1 us-gaap_ComprehensiveIncomeNetOfTax | 1,060.6 us-gaap_ComprehensiveIncomeNetOfTax
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash Dividends from Subsidiaries |  |  |  |  |  |  |  |  | 645.2 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 636.6 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 670.8 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Income |  |  |  |  |  |  |  |  | 116.3 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 56.9 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 55.0 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Revenue |  |  |  |  |  |  |  |  | 761.5 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 693.5 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 725.8 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest and Debt Expense |  |  |  |  |  |  |  |  | 132.4 us-gaap_InterestExpenseDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 120.9 us-gaap_InterestExpenseDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 114.2 us-gaap_InterestExpenseDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Expenses |  |  |  |  |  |  |  |  | 66.0 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 48.9 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 65.5 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Expenses |  |  |  |  |  |  |  |  | 198.4 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 169.8 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 179.7 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Before Income Tax |  |  |  |  |  |  |  |  | 563.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 523.7 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 546.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (24.5)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (14.7)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (25.7)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income of Parent Company |  |  |  |  |  |  |  |  | 587.6 unm_IncomeBeforeEquityInUndistributedEarningsLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 538.4 unm_IncomeBeforeEquityInUndistributedEarningsLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 571.8 unm_IncomeBeforeEquityInUndistributedEarningsLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in Undistibuted Earnings (Loss) of Subsidiaries |  |  |  |  |  |  |  |  | (174.2)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 319.7 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 322.6 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Income |  |  |  |  |  |  |  |  | 413.4 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 858.1 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 894.4 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | (88.6)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (373.0)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 166.2 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive Income |  |  |  |  |  |  |  |  | $ 324.8 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 485.1 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 1,060.6 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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