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Property and Casualty Insurance Reserves - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Actuary estimate period used for ultimate and LAE | 10 years |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | $ 22.6 |  | $ (14.6) |
Reinsurance recoverables | 78.7 | $ 86.5 |  |
Non-Core Operations |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development |  | 24.8 |  |
Commercial Automobile |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | 7.2 |  |  |
Specialty Automobile |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development |  | 108.7 | (17.6) |
Commercial Automobile |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development |  | 24.2 | 3.6 |
Property and Liability Insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | 29.8 | 159.8 | (14.6) |
Reinsurance recoverables | $ 24.3 | $ 27.8 | $ 39.6 | $ 41.9

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-5 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477409/944-310-45-5 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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