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Short-Duration Insurance Contracts - Reconciliation of Net Incurred and Paid Claims (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |
Gross reserves, end of year | $ 581.7 | $ 564.0 | [1]
Property & Casualty and Group Benefits |  |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 390.4 | 360.5 |
Reinsurance recoverable, including reinsurance premium paid | 138.9 | 139.0 |
Unallocated claims adjustment expenses | 11.3 | 21.0 |
Total other than short duration and unallocated claims adjustment expenses | 52.4 | 64.5 |
Gross reserves, end of year | 581.7 | 564.0 |
Property & Casualty and Group Benefits | Homeowners |  |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 73.4 | 61.0 |
Reinsurance recoverable (payable), including reinsurance premium paid | 2.2 | (4.4) |
Property & Casualty and Group Benefits | Auto liability |  |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 200.9 | 192.5 |
Reinsurance recoverable, including reinsurance premium paid | 96.6 | 97.6 |
Property & Casualty and Group Benefits | Auto physical damage |  |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 11.0 | 10.6 |
Property & Casualty and Group Benefits | Specialty health |  |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 10.9 | 16.9 |
Reinsurance recoverable, including reinsurance premium paid | 0.2 | 0.2 |
Property & Casualty and Group Benefits | Group disability |  |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 83.2 | 69.0 |
Reinsurance recoverable, including reinsurance premium paid | 25.0 | 25.6 |
Property & Casualty and Group Benefits | Other than short duration lines |  |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 11.0 | 10.5 |
Reinsurance recoverable, including reinsurance premium paid | 14.9 | 20.0 |
Property & Casualty and Group Benefits | Insurance lines other than short duration |  |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |
Insurance lines other than short duration | $ 41.1 | $ 43.5 |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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