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Treasury Stock Transactions (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |
Number of Treasury Shares Repurchased | 8.7 us-gaap_TreasuryStockSharesAcquired | 11.2 us-gaap_TreasuryStockSharesAcquired | 23.6 us-gaap_TreasuryStockSharesAcquired
Cost of Shares Repurchased | $ 300.6 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 318.6 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 500.6 us-gaap_TreasuryStockValueAcquiredCostMethod
Commission Paid on Stock Repurchases | 0.1 unm_SharesRepurchasedCostCommissions | 0.2 unm_SharesRepurchasedCostCommissions | 0.6 unm_SharesRepurchasedCostCommissions
Repurchase Program Authorized in December 2013 |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Authorized Amount of Treasury Share Repurchases Under Stock Repurchase Program | 750.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = unm_RepurchaseProgramAuthorizedinDecember2013Member |  |
Remaining Amount of Treasury Share Repurchases Authorized Under Stock Repurchase Program | 429.5 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_ShareRepurchaseProgramAxis = unm_RepurchaseProgramAuthorizedinDecember2013Member |  |
Repurchase Program Authorized in July 2012 |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Authorized Amount of Treasury Share Repurchases Under Stock Repurchase Program | 750.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = unm_RepurchaseProgramAuthorizedinJuly2012Member |  |
Remaining Amount of Treasury Share Repurchases Authorized Under Stock Repurchase Program | 0 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_ShareRepurchaseProgramAxis = unm_RepurchaseProgramAuthorizedinJuly2012Member |  |
Repurchase Program Authorized in February 2011 |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Authorized Amount of Treasury Share Repurchases Under Stock Repurchase Program | 1,000.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = unm_RepurchaseProgramAuthorizedinFebruary2011Member |  |
Remaining Amount of Treasury Share Repurchases Authorized Under Stock Repurchase Program | $ 0 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_ShareRepurchaseProgramAxis = unm_RepurchaseProgramAuthorizedinFebruary2011Member |  |

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- Definition Fees and Commission Expenses + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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Balance Type: | credit
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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