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v3.25.4

Segment Information Segments - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 USD ($) Integer | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Supplementary Insurance Information, by Segment |  |  |
Number of Operating Segments | Integer | 3 |  |
Goodwill | $ 353.9 | $ 349.1 |
Loss on Legal Settlement |  | 15.3 |
Number of Reportable Segments | Integer | 5 |  |
Compensation Expense |  |  |
Supplementary Insurance Information, by Segment |  |  |
Loss on Legal Settlement | $ 4.9 |  |
Other Expense |  |  |
Supplementary Insurance Information, by Segment |  |  |
Loss on Legal Settlement | 10.4 |  |
Operating Segments |  |  |
Supplementary Insurance Information, by Segment |  |  |
Loss on Legal Settlement | 0.0 | 15.3 | $ 0.0
Unum US |  |  |
Supplementary Insurance Information, by Segment |  |  |
Goodwill | 281.2 | 280.0 |
Unum International |  |  |
Supplementary Insurance Information, by Segment |  |  |
Goodwill | 45.0 | 41.4 |
Colonial Life |  |  |
Supplementary Insurance Information, by Segment |  |  |
Goodwill | $ 27.7 | $ 27.7 |

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