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v2.4.1.9

Accounting Updates Outstanding (Details) (USD $) | 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
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted | $ (1.11)us-gaap_EarningsPerShareDiluted | $ 0.87 us-gaap_EarningsPerShareDiluted | $ 0.94 us-gaap_EarningsPerShareDiluted | $ 0.88 us-gaap_EarningsPerShareDiluted | $ 0.84 us-gaap_EarningsPerShareDiluted | $ 0.78 us-gaap_EarningsPerShareDiluted | $ 0.82 us-gaap_EarningsPerShareDiluted | $ 0.79 us-gaap_EarningsPerShareDiluted | $ 1.61 us-gaap_EarningsPerShareDiluted | $ 3.23 us-gaap_EarningsPerShareDiluted | $ 3.17 us-gaap_EarningsPerShareDiluted
Accounting Standards Update 2014-01 | Previously Reported |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | $ 413,400,000.0 us-gaap_ProfitLoss / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 858,100,000.0 us-gaap_ProfitLoss / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 894,400,000.0 us-gaap_ProfitLoss / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Earnings Per Share, Diluted |  |  |  |  |  |  |  |  | $ 1.61 us-gaap_EarningsPerShareDiluted / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 3.23 us-gaap_EarningsPerShareDiluted / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 3.17 us-gaap_EarningsPerShareDiluted / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Accounting Standards Update 2014-01 | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |  |  |
After Tax Impact of Adoption of New Accounting Pronouncement on Net Income |  |  |  |  |  |  |  |  | (11,300,000.0)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember | (11,100,000.0)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember | (6,300,000.0)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
After Tax Impact of Adoption of New Accounting Pronouncement on EPS |  |  |  |  |  |  |  |  | $ (0.04)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember | $ (0.04)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember | $ (0.02)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Effect of Adoption of New Accounting Pronouncement on Retained Earnings | 30,000,000 us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1 / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |  |  | 19,000,000 us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1 / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |  |  | 30,000,000 us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1 / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember | 19,000,000 us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1 / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember | 8,000,000 us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1 / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Accounting Standards Update 2014-01 | Reported After Adjustments |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | $ 402,100,000.0 us-gaap_ProfitLoss / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = unm_ScenarioReportedAfterAdjustmentsMember | $ 847,000,000 us-gaap_ProfitLoss / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = unm_ScenarioReportedAfterAdjustmentsMember | $ 888,100,000.0 us-gaap_ProfitLoss / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = unm_ScenarioReportedAfterAdjustmentsMember
Earnings Per Share, Diluted |  |  |  |  |  |  |  |  | $ 1.57 us-gaap_EarningsPerShareDiluted / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = unm_ScenarioReportedAfterAdjustmentsMember | $ 3.19 us-gaap_EarningsPerShareDiluted / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = unm_ScenarioReportedAfterAdjustmentsMember | $ 3.15 us-gaap_EarningsPerShareDiluted / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = unm_AccountingStandardsUpdate201401Member / us-gaap_StatementScenarioAxis = unm_ScenarioReportedAfterAdjustmentsMember

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