Loss and Loss Adjustment Expense Reserves - Additional Information (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Insurance [Abstract] | ||
| Prior years | $ (4.6) | $ (10.6) |
| Gain from reinsurance commutation | 2.6 | |
| Favorable net loss related to property lines | $ 2.0 | |
| Attritional reserves release | 8.2 | |
| Catastrophe reserves release | $ 2.4 | |
| X | ||||||||||
- Definition Liability for Unpaid Claims and Claims Adjustment Expense, Attritional Reserves Release No definition available.
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| X | ||||||||||
- Definition Liability for Unpaid Claims and Claims Adjustment Expense, Catastrophe Reserves Release No definition available.
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| X | ||||||||||
- Definition Liability for Unpaid Claims and Claims Adjustment Expense, Gain (Loss) From Reinsurance Commutation No definition available.
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| X | ||||||||||
- Definition Liability for Unpaid Claims and Claims Adjustment Expense, Gain (Loss) On Property Lines No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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