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Reinsurance (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jul. 01, 2025 | Dec. 31, 2024
Effects of Reinsurance |  |  |  |  |  |  |  |
Cash Related to Reinsurance Agreement |  |  |  | $ 953.5 |  | $ 0.0 |  |
Negative Ceding Commission |  |  |  |  |  |  | $ 461.7 |
Debt Securities, Available-for-Sale |  | $ 33,190.2 |  | 33,190.2 |  |  |  | $ 35,629.9
Accrued Investment Income |  | 735.7 |  | 735.7 |  |  |  | 649.8
Net Investment Loss |  | 128.0 | $ (12.9) | (96.5) |  | (24.5) |  |
Reinsurance Recoverable |  | 11,683.2 |  | 11,683.2 |  |  |  | $ 8,296.4
Amortization of Deferred Loss on Reinsurance |  | 48.6 | 10.4 | 67.9 |  | 31.1 |  |
Amortization of Deferred Gain on Reinsurance |  | 4.6 | 0.0 | 4.6 |  | 0.0 |  |
Operating Segments |  |  |  |  |  |  |  |
Effects of Reinsurance |  |  |  |  |  |  |  |
Net Investment Loss |  | 128.0 | (12.9) | (96.5) |  | (24.5) |  |
Long-term Care and Individual Disability Reinsurance Transaction |  |  |  |  |  |  |  |
Effects of Reinsurance |  |  |  |  |  |  |  |
Cash Related to Reinsurance Agreement |  |  |  | 953.5 |  |  |  |
Debt Securities, Available-for-Sale |  |  |  |  |  |  | 3,230.1 |
Accrued Investment Income |  |  |  |  |  |  | 47.1 |
Reinsurance Recoverable |  |  |  |  |  |  | 3,620.5 |
Long-term Care and Individual Disability Reinsurance Transaction | Operating Segments |  |  |  |  |  |  |  |
Effects of Reinsurance |  |  |  |  |  |  |  |
Net Investment Loss |  | 137.6 | $ 0.0 | (46.8) |  | $ 0.0 |  |
Change in Deferred Acquisition Costs | [1] |  |  | 100.3 |  |  |  |
Long-term Care and Individual Disability Reinsurance Transaction | Unum US |  |  |  |  |  |  |  |
Effects of Reinsurance |  |  |  |  |  |  |  |
Change in Deferred Acquisition Costs | [1] |  |  | 100.3 |  |  |  |
Long-term Care and Individual Disability Reinsurance Transaction | Long-term Care | Closed Block |  |  |  |  |  |  |  |
Effects of Reinsurance |  |  |  |  |  |  |  |
Reinsurance Recoverable |  |  |  |  |  |  | 3,315.2 |
DeferredLossOnReinsurance |  |  |  |  |  |  | 846.5 |
Amortization of Deferred Loss on Reinsurance |  | 38.9 |  |  |  |  |  |
Long-term Care and Individual Disability Reinsurance Transaction | Individual Disability | Unum US |  |  |  |  |  |  |  |
Effects of Reinsurance |  |  |  |  |  |  |  |
Reinsurance Recoverable |  |  |  |  |  |  | 305.3 |
DeferredGainOnReinsurance |  |  |  |  |  |  | $ 148.2 |
Change in Deferred Acquisition Costs |  | 100.3 |  | $ 100.3 | [1] |  |  |
Amortization of Deferred Gain on Reinsurance |  | $ 4.6 |  |  |  |  |  |
[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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