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Reserve for Loss and Loss Adjustment Expenses - Schedule of Prior Year Loss Development for the AmTrust Reinsurance Segment (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2025
Segment Reporting Information [Line Items]
Total AmTrust Reinsurance PPD	$ (7,788)	$ (7,788)
AmTrust Reinsurance
Segment Reporting Information [Line Items]
Total AmTrust Reinsurance PPD	(7,913)	(7,913)
AmTrust Reinsurance | AmTrust Quota Share
Segment Reporting Information [Line Items]
Total AmTrust Reinsurance PPD	(4,200)	(4,200)
AmTrust Reinsurance | LPT/ADC Agreement
Segment Reporting Information [Line Items]
Total AmTrust Reinsurance PPD	(3,718)	(3,718)
AmTrust Reinsurance | European Hospital Liability Quota Share
Segment Reporting Information [Line Items]
Total AmTrust Reinsurance PPD	$ 5	$ 5

X

- Definition

Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease), Net of Commission Changes

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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X

- Details

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X

- Details

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