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Realized Investment Gains and Losses Reported in Consolidated Statements of Income (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Fixed Maturity Securities |  |  |  |  |  |  |  |  |  |  |
Gross Gains on Sales |  |  |  |  |  |  |  |  | $ 9.3 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 15.8 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 29.3 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross Losses on Sales |  |  |  |  |  |  |  |  | (7.5)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | (45.7)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | (20.4)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Other-Than-Temporary Impairment Loss |  |  |  |  |  |  |  |  | (13.5)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | (0.8)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Mortgage Loans and Other Invested Assets |  |  |  |  |  |  |  |  |  |  |
Gross Gains on Sales |  |  |  |  |  |  |  |  | 21.2 unm_OtherInvestmentsGrossRealizedGains | 15.6 unm_OtherInvestmentsGrossRealizedGains | 5.0 unm_OtherInvestmentsGrossRealizedGains
Other Investments Gross Realized Losses |  |  |  |  |  |  |  |  | (0.8)unm_OtherInvestmentsGrossRealizedLosses | 0 unm_OtherInvestmentsGrossRealizedLosses | (4.3)unm_OtherInvestmentsGrossRealizedLosses
Impairment Loss |  |  |  |  |  |  |  |  | (3.4)us-gaap_ImpairmentOfInvestments | (2.0)us-gaap_ImpairmentOfInvestments | (1.9)us-gaap_ImpairmentOfInvestments
Gain (Loss) on Embedded Derivative |  |  |  |  |  |  |  |  | 3.3 us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet | 30.7 us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet | 51.8 us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
Derivative, Gain (Loss) on Derivative, Net |  |  |  |  |  |  |  |  | 11.0 us-gaap_DerivativeGainLossOnDerivativeNet | (1.9)us-gaap_DerivativeGainLossOnDerivativeNet | 0 us-gaap_DerivativeGainLossOnDerivativeNet
Foreign Currency Transactions |  |  |  |  |  |  |  |  | (3.5)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | (4.9)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | (3.3)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Net Realized Investment Gain | $ (17.3)us-gaap_GainLossOnInvestments | $ 1.2 us-gaap_GainLossOnInvestments | $ 25.9 us-gaap_GainLossOnInvestments | $ 6.3 us-gaap_GainLossOnInvestments | $ 9.3 us-gaap_GainLossOnInvestments | $ (26.1)us-gaap_GainLossOnInvestments | $ 13.3 us-gaap_GainLossOnInvestments | $ 10.3 us-gaap_GainLossOnInvestments | $ 16.1 us-gaap_GainLossOnInvestments | $ 6.8 us-gaap_GainLossOnInvestments | $ 56.2 us-gaap_GainLossOnInvestments

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- Definition Other Investments Gross Realized Losses + References No definition available. + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284393-111563 + Details
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