XML 59 R49.htm IDEA: XBRL DOCUMENT
v3.23.2

Mortgage Loans, Sorted by Applicable Credit Quality Indicators (Detail) - USD ($) $ in Millions | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | $ 2,372.8 |  | $ 2,435.4 |  |  |
Loan to Value Ratio Below or Equal to 65 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 1,381.2 |  | 1,389.6 |  |  |
Loan To Value Ratio Above 65 To 75 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 815.2 |  | 937.2 |  |  |
Loan To Value Ratio Above 75 To 85 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 111.5 |  | 75.0 |  |  |
Loan To Value Ratio Above 85 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 64.9 |  | 33.6 |  |  |
Originated Five or More Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 1,399.0 |  | 1,104.2 |  |  |
Originated Four Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 339.2 |  | 374.7 |  |  |
Originated Three Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 167.1 |  | 343.5 |  |  |
Originated Two Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 351.3 |  | 169.3 |  |  |
Originated in Fiscal Year before Latest Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 87.7 |  | 355.6 |  |  |
Originated in Current Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 28.5 |  | 88.1 |  |  |
Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 1,406.6 |  | 1,108.5 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 340.5 |  | 376.5 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 167.7 |  | 344.8 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 352.3 |  | 169.9 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 88.2 |  | 356.4 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 28.6 |  | 88.6 |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,383.9 |  | 2,444.7 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 11.1 |  | 9.3 |  |  |
Commercial Real Estate | Loan to Value Ratio Below or Equal to 65 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 951.5 |  | 782.6 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 200.4 |  | 189.0 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 80.2 |  | 193.9 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 135.9 |  | 81.3 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 16.6 |  | 128.9 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0.0 |  | 16.9 |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,384.6 |  | 1,392.6 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 3.3 | $ 3.0 | 3.0 | $ 2.3 | $ 2.4 | $ 2.6
Commercial Real Estate | Loan To Value Ratio Above 65 To 75 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 284.1 |  | 230.2 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 140.1 |  | 181.6 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 79.1 |  | 150.9 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 216.4 |  | 80.1 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 71.6 |  | 227.5 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 28.6 |  | 71.7 |  |  |
Financing Receivable, before Allowance for Credit Loss | 819.9 |  | 942.0 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 4.8 | 5.3 | 4.7 | 4.8 | 4.5 | 4.7
Commercial Real Estate | Loan To Value Ratio Above 75 To 85 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 104.0 |  | 67.5 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 8.4 |  | 0.0 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0.0 |  | 8.5 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, before Allowance for Credit Loss | 112.4 |  | 76.0 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 0.9 | 1.2 | 1.1 | 0.9 | 0.7 | 0.7
Commercial Real Estate | Loan To Value Ratio Above 85 Percent |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 67.0 |  | 28.2 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0.0 |  | 5.9 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, before Allowance for Credit Loss | 67.0 |  | 34.1 |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 2.1 | $ 0.5 | 0.5 | $ 0.4 | $ 0.3 | $ 0.3
Commercial Real Estate | Originated Five or More Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 7.6 |  | 4.3 |  |  |
Commercial Real Estate | Originated Four Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 1.3 |  | 1.8 |  |  |
Commercial Real Estate | Originated Three Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 0.6 |  | 1.3 |  |  |
Commercial Real Estate | Originated Two Years before Last Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 1.0 |  | 0.6 |  |  |
Commercial Real Estate | Originated in Fiscal Year before Latest Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 0.5 |  | 0.8 |  |  |
Commercial Real Estate | Originated in Current Fiscal Year |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 0.1 |  | 0.5 |  |  |
AA Credit Rating |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 79.6 |  | 92.3 |  |  |
AA Credit Rating | Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 68.7 |  | 53.8 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 11.0 |  | 27.5 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0.0 |  | 11.1 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, before Allowance for Credit Loss | 79.7 |  | 92.4 |  |  |
A Credit Rating |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 826.6 |  | 843.9 |  |  |
A Credit Rating | Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 565.5 |  | 485.0 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 95.3 |  | 123.3 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 48.5 |  | 96.8 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 80.0 |  | 35.9 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 23.6 |  | 80.6 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 15.5 |  | 24.0 |  |  |
Financing Receivable, before Allowance for Credit Loss | 828.4 |  | 845.6 |  |  |
BBB Credit Rating |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 1,404.0 |  | 1,458.0 |  |  |
BBB Credit Rating | Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 707.8 |  | 534.0 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 234.2 |  | 219.8 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 119.2 |  | 236.9 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 272.3 |  | 134.0 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 64.6 |  | 275.8 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 13.1 |  | 64.6 |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,411.2 |  | 1,465.1 |  |  |
BB Credit Rating |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Mortgage Loans, Carrying Amount | 62.6 |  | 41.2 |  |  |
BB Credit Rating | Commercial Real Estate |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 64.6 |  | 35.7 |  |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0.0 |  | 5.9 |  |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0.0 |  | 0.0 |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 64.6 |  | $ 41.6 |  |  |

X
- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1 + Details
Name: | srt_MortgageLoansOnRealEstateLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) -Publisher SEC Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) -Publisher SEC Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(1) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amortized cost of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
Name: | us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-80 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) -Publisher SEC Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) -Publisher SEC Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-K (SK) -Number 229 -Section 1404 -Paragraph (a) -Publisher SEC Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-14 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7A -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-7A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_LoanToValueAxis=unm_LoanToValueRatioBelowOrEqualTo65PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanToValueAxis=unm_LoanToValueRatioAbove65To75PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanToValueAxis=unm_LoanToValueRatioAbove75To85PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanToValueAxis=unm_LoanToValueRatioAbove85PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unm_FinancingReceivableOriginationPeriodAxis=unm_OriginatedFiveOrMoreYearsBeforeLastFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unm_FinancingReceivableOriginationPeriodAxis=unm_OriginatedFourYearsBeforeLastFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unm_FinancingReceivableOriginationPeriodAxis=unm_OriginatedThreeYearsBeforeLastFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unm_FinancingReceivableOriginationPeriodAxis=unm_OriginatedTwoYearsBeforeLastFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unm_FinancingReceivableOriginationPeriodAxis=unm_OriginatedInFiscalYearBeforeLatestFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unm_FinancingReceivableOriginationPeriodAxis=unm_OriginatedInCurrentFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=unm_AACreditRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=unm_CreditRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=unm_BBBCreditRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=unm_BBCreditRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |