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Schedule III Supplementary Insurance Information | 12 Months Ended
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Dec. 31, 2025
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract] |
Supplementary Insurance Information, for Insurance Companies Disclosure | SCHEDULE III--SUPPLEMENTARY INSURANCE INFORMATION Unum Group and Subsidiaries
Segment |  | Deferred Acquisition Costs |  | Future Policy Benefits |  | Policyholders' Account Balances |  | Unearned Premiums
|  | (in millions of dollars)
December 31, 2025 |  |  |  |  |  |  |  |
Unum US |  | $ | 1,208.7 |  |  | $ | 8,493.4 |  |  | $ | 665.7 |  |  | $ | 48.7 |
Unum International |  | 72.1 |  |  | 2,404.3 |  |  | — |  |  | 201.5 |
Colonial Life |  | 1,639.5 |  |  | 2,032.0 |  |  | 858.9 |  |  | 46.9 |
Closed Block |  | — |  |  | 25,087.3 |  |  | 4,111.8 |  |  | 115.7 |
Total |  | $ | 2,920.3 |  |  | $ | 38,017.0 |  |  | $ | 5,636.4 |  |  | $ | 412.8 |
December 31, 2024 |  |  |  |  |  |  |  |
Unum US |  | $ | 1,260.6 |  |  | $ | 8,669.7 |  |  | $ | 675.7 |  |  | $ | 51.7 |
Unum International |  | 53.0 |  |  | 2,163.0 |  |  | — |  |  | 165.5 |
Colonial Life |  | 1,529.2 |  |  | 1,904.2 |  |  | 862.5 |  |  | 45.4 |
Closed Block |  | — |  |  | 24,069.5 |  |  | 4,095.5 |  |  | 121.4 |
Total |  | $ | 2,842.8 |  |  | $ | 36,806.4 |  |  | $ | 5,633.7 |  |  | $ | 384.0 |
SCHEDULE III--SUPPLEMENTARY INSURANCE INFORMATION (Continued) Unum Group and Subsidiaries
Segment |  | Premium Income |  | Net Investment Income 1 |  | Policy Benefits Including Remeasurement Loss or Gain 2 |  | Amortization of Deferred Acquisition Costs |  | All Other Expenses 3 |  | Premiums Written 4
|  | (in millions of dollars)
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |
Unum US |  | $ | 7,083.5 |  |  | $ | 604.2 |  |  | $ | 4,120.4 |  |  | $ | 283.3 |  |  | $ | 2,115.2 |  |  | $ | 4,947.5 |
Unum International |  | 1,082.8 |  |  | 145.6 |  |  | 767.4 |  |  | 10.7 |  |  | 300.3 |  |  | 613.6 |
Colonial Life |  | 1,839.1 |  |  | 172.6 |  |  | 876.2 |  |  | 233.1 |  |  | 431.5 |  |  | 1,278.1 |
Closed Block |  | 825.6 |  |  | 1,016.5 |  |  | 2,301.3 |  |  | — |  |  | 313.0 |  |  | 818.8 |
Corporate |  | — |  |  | 93.8 |  |  | — |  |  | — |  |  | 389.6 |  |  | — |
Total |  | $ | 10,831.0 |  |  | $ | 2,032.7 |  |  | $ | 8,065.3 |  |  | $ | 527.1 |  |  | $ | 3,549.6 |  |  |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Unum US |  | $ | 6,883.2 |  |  | $ | 632.2 |  |  | $ | 3,864.7 |  |  | $ | 292.5 |  |  | $ | 2,011.3 |  |  | $ | 4,834.0 |
Unum International |  | 949.5 |  |  | 128.8 |  |  | 656.7 |  |  | 9.5 |  |  | 263.4 |  |  | 581.6 |
Colonial Life |  | 1,783.9 |  |  | 161.5 |  |  | 804.7 |  |  | 219.0 |  |  | 413.0 |  |  | 1,247.4 |
Closed Block |  | 880.8 |  |  | 1,148.9 |  |  | 1,591.8 |  |  | — |  |  | 243.0 |  |  | 868.1 |
Corporate |  | — |  |  | 58.6 |  |  | — |  |  | — |  |  | 266.4 |  |  | — |
Total |  | $ | 10,497.4 |  |  | $ | 2,130.0 |  |  | $ | 6,917.9 |  |  | $ | 521.0 |  |  | $ | 3,197.1 |  |  |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Unum US |  | $ | 6,579.2 |  |  | $ | 639.9 |  |  | $ | 3,808.5 |  |  | $ | 267.6 |  |  | $ | 1,879.2 |  |  | $ | 4,634.3 |
Unum International |  | 825.2 |  |  | 137.2 |  |  | 579.8 |  |  | 8.4 |  |  | 235.6 |  |  | 544.4 |
Colonial Life |  | 1,726.1 |  |  | 153.5 |  |  | 798.1 |  |  | 205.4 |  |  | 396.5 |  |  | 1,221.8 |
Closed Block |  | 915.5 |  |  | 1,066.3 |  |  | 2,070.7 |  |  | — |  |  | 246.5 |  |  | 904.2 |
Corporate |  | — |  |  | 99.8 |  |  | — |  |  | — |  |  | 249.5 |  |  | — |
Total |  | $ | 10,046.0 |  |  | $ | 2,096.7 |  |  | $ | 7,257.1 |  |  | $ | 481.4 |  |  | $ | 3,007.3 |  |  |
1 Net investment income is allocated based upon segmentation. Each segment has its own specifically identified assets and receives the investment income generated by those assets. 2 Included in policy benefits including remeasurement loss or gain were the following: •In 2025, reserve assumption updates resulting in a net decrease in policy benefits including remeasurement gain or loss in the Unum US, Colonial Life and Unum International segments of $147.7 million, $8.9 million, $5.4 million, respectively, and a net increase in policy benefits including remeasurement gain or loss in the Closed Block segment of $640.5 million. •In 2024, reserve assumption updates resulting in a net decrease in policy benefits including remeasurement gain or loss in the Unum US, Colonial Life, and Closed Block segments of $143.6 million, $46.0 million, and $175.3 million, respectively, and a net increase in policy benefits including remeasurement gain or loss in the Unum International segment of $7.5 million. •In 2023, reserve assumption updates resulting in a net decrease in policy benefits including remeasurement gain or loss in the Unum US, and Colonial Life segments of $128.8 million and $80.7 million, r espectively, and a net increase in policy benefits including remeasurement gain or loss in the Unum International and Closed Block Segments of $17.9 million and $368.8 million, respectively. •In 2025, 2024, and 2023 the impact of non-contemporaneous reinsurance of $28.6 million, $25.1 million, and $34.8 million, respectively, in the Closed Block segment. In 2025, the impact of non-contemporaneous reinsurance of $1.0 million i n the Unum US segment. SCHEDULE III--SUPPLEMENTARY INSURANCE INFORMATION (Continued) Unum Group and Subsidiaries 3 Includes commissions, interest and debt expense, deferral of acquisition costs, compensation expense, and other expenses. Where not directly attributable to a segment, expenses are generally allocated based on activity levels, time information, and usage statistics. Also included in all other expenses were the following: •In 2025, 2024 and 2023 the amortization of the cost of reinsurance of $116.7 million, $41.4 million, and $44.1 million respectively, in the Closed Block segment. •In 2025, we incurred an expense related to an accelerated charitable contribution of $20.0 million, in the Corporate segment. •In 2025, we incurred a settlement loss on the U.S. pension plan annuity purchase of $103.8 million, in the Corporate segment. •In 2024, we incurred a loss on legal settlement of $15.3 million for the settlement of an employment-related matter, in the Corporate segment. 4 Excludes life insurance.

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- Definition The entire disclosure for supplementary insurance information by segment. Includes, but is not limited to, deferred policy acquisition cost; future policy benefit, loss, claim and loss expenses; unearned premium; other policy claim and benefit payable; premium revenue; net investment income; benefit, claim, loss and settlement expenses; amortization of deferred policy acquisition cost; other operating expense; and premium written. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 16 -Paragraph Column J -Footnote 3 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 16 -Paragraph Column G -Footnote 3 -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column G)(Footnote 3)) -SubTopic 235 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column J)(Footnote 3)) -SubTopic 235 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-1 + Details
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