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Property and Casualty Insurance Reserves - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | $ (67.9) | $ 15.6
Personal Automobile |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | (40.0) | 25.0
Preferred Automobile |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | (7.8) | (1.6)
Homeowners |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | (4.0) | (5.3)
Other Personal Lines |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | (0.9) | (5.8)
Commercial Automobile |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | $ (15.2) | $ (7.4)

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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