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Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Deferred Acquisition Costs at Beginning of Year |  | $ 2,842.8 |  |
Amortization expense |  | (527.1) | $ (521.0) | $ (481.4)
Deferred Acquisition Costs at End of Year |  | 2,920.3 | 2,842.8 |
Operating Segments |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Deferred Acquisition Costs at Beginning of Year |  | 2,842.8 | 2,714.5 | 2,560.0
Capitalization |  | 697.1 | 651.5 | 632.2
Amortization expense |  | (527.1) | (521.0) | (481.4)
Foreign currency |  | 7.8 | (2.2) | 3.7
Deferred Acquisition Costs at End of Year |  | 2,920.3 | 2,842.8 | 2,714.5
Operating Segments | Long-term Care and Individual Disability Reinsurance Transaction |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Change in Deferred Acquisition Costs | [1] | (100.3) |  |
Unum US |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Deferred Acquisition Costs at Beginning of Year |  | 1,260.6 | 1,232.2 | 1,185.1
Capitalization |  | 331.7 | 320.9 | 314.7
Amortization expense |  | (283.3) | (292.5) | (267.6)
Foreign currency |  | 0.0 | 0.0 | 0.0
Deferred Acquisition Costs at End of Year |  | 1,208.7 | 1,260.6 | 1,232.2
Unum US | Long-term Care and Individual Disability Reinsurance Transaction |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Change in Deferred Acquisition Costs | [1] | (100.3) |  |
Unum US | Operating Segments |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Amortization expense |  | (283.3) | (292.5) | (267.6)
Unum International |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Deferred Acquisition Costs at Beginning of Year |  | 53.0 | 46.9 | 37.0
Capitalization |  | 22.0 | 17.8 | 14.6
Amortization expense |  | (10.7) | (9.5) | (8.4)
Foreign currency |  | 7.8 | (2.2) | 3.7
Deferred Acquisition Costs at End of Year |  | 72.1 | 53.0 | 46.9
Unum International | Operating Segments |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Amortization expense |  | (10.7) | (9.5) | (8.4)
Colonial Life |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Deferred Acquisition Costs at Beginning of Year |  | 1,529.2 | 1,435.4 | 1,337.9
Capitalization |  | 343.4 | 312.8 | 302.9
Amortization expense |  | (233.1) | (219.0) | (205.4)
Foreign currency |  | 0.0 | 0.0 | 0.0
Deferred Acquisition Costs at End of Year |  | 1,639.5 | 1,529.2 | 1,435.4
Colonial Life | Operating Segments |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Amortization expense |  | (233.1) | (219.0) | (205.4)
Group Disability | Unum US |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Deferred Acquisition Costs at Beginning of Year |  | 61.1 | 63.6 | 61.0
Capitalization |  | 60.7 | 62.2 | 60.2
Amortization expense |  | (58.2) | (64.7) | (57.6)
Deferred Acquisition Costs at End of Year |  | 63.6 | 61.1 | 63.6
Group Life and AD&D | Unum US |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Deferred Acquisition Costs at Beginning of Year |  | 51.1 | 48.9 | 49.3
Capitalization |  | 45.5 | 40.6 | 38.6
Amortization expense |  | (39.0) | (38.4) | (39.0)
Deferred Acquisition Costs at End of Year |  | 57.6 | 51.1 | 48.9
Voluntary Benefits | Unum US |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Deferred Acquisition Costs at Beginning of Year |  | 614.3 | 610.6 | 601.0
Capitalization |  | 123.3 | 120.2 | 115.8
Amortization expense |  | (114.8) | (116.5) | (106.2)
Deferred Acquisition Costs at End of Year |  | 622.8 | 614.3 | 610.6
Individual Disability | Unum US |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Deferred Acquisition Costs at Beginning of Year |  | 521.2 | 497.8 | 464.4
Capitalization |  | 87.4 | 83.4 | 87.4
Amortization expense |  | (56.7) | (60.0) | (54.0)
Deferred Acquisition Costs at End of Year |  | 451.6 | 521.2 | 497.8
Individual Disability | Unum US | Long-term Care and Individual Disability Reinsurance Transaction |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Change in Deferred Acquisition Costs | [1] | (100.3) |  |
Dental and Vision | Unum US |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |  |
Deferred Acquisition Costs at Beginning of Year |  | 12.9 | 11.3 | 9.4
Capitalization |  | 14.8 | 14.5 | 12.7
Amortization expense |  | (14.6) | (12.9) | (10.8)
Deferred Acquisition Costs at End of Year |  | $ 13.1 | $ 12.9 | $ 11.3
[1] | 1 Reflects the impacts of DAC written off related to the Fortitude Re reinsurance transaction. See Note 14 for further discussion of the reinsurance transaction.

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