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Loss and Loss Adjustment Expense Reserves (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years | $ 1,147.0 | $ 52.8
Personal Lines | Personal auto business |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years | 866.0 | (28.0)
Personal Lines | Personal auto business | Direct |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years |  | (25.0)
Commercial Lines |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years | 277.0 | 77.0
Short-Duration Insurance Contract, Accident Year 2022 |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years | 929.0 |
Short-Duration Insurance Contract, Accident Year 2021 |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years | $ 108.0 | 45.0
Short Duration Insurance Contract Accident Years 2019 and Prior |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years |  | 29.0
Short-Duration Insurance Contract, Accident Year 2020 |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years |  | $ (21.0)

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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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