XML 73 R61.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Accumulated Other Comprehensive Income, Net of Tax |  |
Net Other Comprehensive Income (Loss) | $ (192.4) | $ 51.4
Balance at End of Period | 9,499.5 | 9,107.4
Net Unrealized Gain on Securities |  |
Accumulated Other Comprehensive Income, Net of Tax |  |
Balance at Beginning of Period | 607.8 | 440.6
Balance at Beginning of Period, as Adjusted | 590.3 |
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax | (234.8) | 44.7
Reclassification from Accumulated Other Comprehensive Income or Loss | 0.6 | (2.3)
Net Other Comprehensive Income (Loss) | (234.2) | 42.4
Balance at End of Period | 356.1 | 483.0
Accumulated Net Gain (Loss) from Designated or Qualifying Hedges |  |
Accumulated Other Comprehensive Income, Net of Tax |  |
Balance at Beginning of Period | 282.3 | 327.5
Balance at Beginning of Period, as Adjusted | 282.3 |
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax | 2.9 | (2.7)
Reclassification from Accumulated Other Comprehensive Income or Loss | (11.7) | (8.0)
Net Other Comprehensive Income (Loss) | (8.8) | (10.7)
Balance at End of Period | 273.5 | 316.8
Foreign Currency Translation Adjustment |  |
Accumulated Other Comprehensive Income, Net of Tax |  |
Balance at Beginning of Period | (254.5) | (354.0)
Balance at Beginning of Period, as Adjusted | (254.5) |
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax | 47.5 | 17.1
Reclassification from Accumulated Other Comprehensive Income or Loss | 0.0 | 0.0
Net Other Comprehensive Income (Loss) | 47.5 | 17.1
Balance at End of Period | (207.0) | (336.9)
Unrecognized Pension and Postretirement Benefit Costs |  |
Accumulated Other Comprehensive Income, Net of Tax |  |
Balance at Beginning of Period | (508.1) | (465.1)
Balance at Beginning of Period, as Adjusted | (508.1) |
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax | (1.2) | (0.6)
Reclassification from Accumulated Other Comprehensive Income or Loss | 4.3 | 3.2
Net Other Comprehensive Income (Loss) | 3.1 | 2.6
Balance at End of Period | (505.0) | (462.5)
Accumulated Other Comprehensive Income (Loss) |  |
Accumulated Other Comprehensive Income, Net of Tax |  |
Balance at Beginning of Period | 127.5 | (51.0)
Cumulative Effect of New Accounting Principle in Period of Adoption | (17.5) | 0.0
Balance at Beginning of Period, as Adjusted | 110.0 | (51.0)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax | (185.6) | 58.5
Reclassification from Accumulated Other Comprehensive Income or Loss | (6.8) | (7.1)
Net Other Comprehensive Income (Loss) | (192.4) | 51.4
Balance at End of Period | (82.4) | $ 0.4
Restatement Adjustment | Accounting Standards Update 2016-01 | Net Unrealized Gain on Securities |  |
Accumulated Other Comprehensive Income, Net of Tax |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | (17.5) |
Restatement Adjustment | Accounting Standards Update 2016-01 | Accumulated Net Gain (Loss) from Designated or Qualifying Hedges |  |
Accumulated Other Comprehensive Income, Net of Tax |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | 0.0 |
Restatement Adjustment | Accounting Standards Update 2016-01 | Foreign Currency Translation Adjustment |  |
Accumulated Other Comprehensive Income, Net of Tax |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | 0.0 |
Restatement Adjustment | Accounting Standards Update 2016-01 | Unrecognized Pension and Postretirement Benefit Costs |  |
Accumulated Other Comprehensive Income, Net of Tax |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | 0.0 |
Restatement Adjustment | Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income (Loss) |  |
Accumulated Other Comprehensive Income, Net of Tax |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ (17.5) |

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_AOCIAttributableToParentNetOfTaxRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: 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=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 + Details
Name: | us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568447-111683 + Details
Name: | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of stockholders' equity including the portion attributable to noncontrolling interests, after the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=unm_AccumulatedNetGainLossfromDesignatedorQualifyingHedgesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedTranslationAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_RestatementAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201601Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |