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Unpaid Claims and Claim Expense Reserves - Reconciliation of Net Incurred and Paid Claims (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |
Gross reserves, end of year | $ 585.1 | $ 425.9
Property & Casualty and Group Benefits |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 360.5 |
Reinsurance recoverables, including reinsurance premium paid | 139.0 |
Unallocated claims adjustment expenses | 21.0 |
Total other than short duration and unallocated claims adjustment expenses | 85.6 |
Gross reserves, end of year | 585.1 |
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 | 61.0 |
Reinsurance recoverables, including reinsurance premium paid | (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 | 192.5 |
Reinsurance recoverables, including reinsurance premium paid | 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 | 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 | 16.9 |
Reinsurance recoverables, including reinsurance premium paid | 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 | 69.0 |
Reinsurance recoverables, including reinsurance premium paid | 25.6 |
Property & Casualty and Group Benefits | Other short duration lines |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 10.5 |
Reinsurance recoverables, including reinsurance premium paid | 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 | $ 64.6 |

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=99404803&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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