Subsequent Events - Additional Information (Details) - USD ($)		12 Months Ended
	Jan. 01, 2026	Dec. 31, 2025
All Other Perilds Catastrophe Excess of Loss | American Coastal Insurance Company
Subsequent Event
Reinsurance, excess retention, amount reinsured, per policy		$ 176,400,000
All Other Perilds Catastrophe Excess of Loss | Subsequent Event | American Coastal Insurance Company
Subsequent Event
Occurrence limit	$ 95,600,000
Reinsurance, amount retained, per policy	10,000,000
Cost of the agreement	11,400,000
Reinsurance, excess retention, amount reinsured, per policy	170,400,000
Catastrophe Excess of Loss | American Coastal Insurance Company
Subsequent Event
Occurrence limit		1,330,000,000
Retention per occurence		14,000,000
Reinsurance, excess retention, amount reinsured, per policy		1,676,000,000
Catastrophe Excess of Loss | Subsequent Event
Subsequent Event
First Event Coverage	95,600,000
Catastrophe Excess of Loss | Subsequent Event | American Coastal Insurance Company
Subsequent Event
Retention per occurence	10,000,000
Reinsurance, excess retention, amount reinsured, per policy	40,000,000
Catastrophe Aggregate Excess of Loss | American Coastal Insurance Company
Subsequent Event
Reinsurance, excess retention, amount reinsured, per policy		$ 40,000,000
Catastrophe Aggregate Excess of Loss | Subsequent Event | American Coastal Insurance Company
Subsequent Event
Occurrence limit	20,000,000
Reinsurance, amount retained, per policy	40,000,000
Cost of the agreement	$ 4,900,000