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Property and Casualty Insurance Reserves - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | $ 17.0 | $ 67.9
Specialty Personal Automobile |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | 7.7 | 40.0
Commercial Automobile |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | (2.6) | 15.2
Non-Core Operations |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | $ 11.9 | $ 12.7

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