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Future Policy Benefits and Claims - Discounting Table (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Short-duration Insurance Contracts, Discounted Liabilities [Line Items] |  |  |
Carrying amount of liabilities for unpaid claims |  | $ 1,295.6 |
Aggregate amount of discount | $ 215.0 |  |
Short-Duration Insurance Contract, Discounted Liability, Interest Accretion, Statement of Financial Position [Extensible Enumeration] | Policyholder Benefits and Claims Incurred, Net | Policyholder Benefits and Claims Incurred, Net | Policyholder Benefits and Claims Incurred, Net
Long-Term Disability/Group Life Waiver |  |  |
Short-duration Insurance Contracts, Discounted Liabilities [Line Items] |  |  |
Carrying amount of liabilities for unpaid claims | $ 1,082.6 | $ 1,076.2 |
Aggregate amount of discount | 215.0 | 209.4 |
Interest accretion | $ 34.7 | $ 33.0 | $ 33.8
Long-Term Disability/Group Life Waiver | Minimum |  |  |
Short-duration Insurance Contracts, Discounted Liabilities [Line Items] |  |  |
Discount rate | 2.80% | 2.80% |
Long-Term Disability/Group Life Waiver | Maximum |  |  |
Short-duration Insurance Contracts, Discounted Liabilities [Line Items] |  |  |
Discount rate | 7.00% | 7.00% |
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML |  |  |
Short-duration Insurance Contracts, Discounted Liabilities [Line Items] |  |  |
Carrying amount of liabilities for unpaid claims | $ 83.7 | $ 79.7 |
Group Life |  |  |
Short-duration Insurance Contracts, Discounted Liabilities [Line Items] |  |  |
Carrying amount of liabilities for unpaid claims | $ 97.1 | $ 73.6 |

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