Catastrophe Reinsurance - Coverage for Catastrophe Reinsurance (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retained
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, reinsured risk, percentage	0.00%	0.00%	0.00%
1st Layer of Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, excess retention, percentage	85.00%	95.00%	95.00%
2nd Layer of Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, excess retention, percentage	95.00%	95.00%	95.00%
3rd Layer of Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, excess retention, percentage	31.70%	95.00%	95.00%
4th Layer of Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, excess retention, percentage		95.00%	95.00%
Minimum
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, amount retained			$ 0
Reinsurance retention policy, excess retention, amount reinsured			65,000,000.0
Minimum | Retained
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, amount retained	$ 0	$ 0	0
Minimum | 1st Layer of Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, excess retention, amount reinsured	50,000,000.0	50,000,000.0	50,000,000.0
Minimum | 2nd Layer of Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, excess retention, amount reinsured	150,000,000.0	150,000,000.0	150,000,000.0
Minimum | 3rd Layer of Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, excess retention, amount reinsured	240,000,000.0	250,000,000.0	250,000,000.0
Minimum | 4th Layer of Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, excess retention, amount reinsured		295,000,000.0	325,000,000.0
Maximum
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, amount retained			65,000,000.0
Reinsurance retention policy, excess retention, amount reinsured			115,000,000.0
Maximum | Retained
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, amount retained	50,000,000.0	50,000,000.0	50,000,000.0
Maximum | 1st Layer of Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, excess retention, amount reinsured	150,000,000.0	150,000,000.0	150,000,000.0
Maximum | 2nd Layer of Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, excess retention, amount reinsured	240,000,000.0	250,000,000.0	250,000,000.0
Maximum | 3rd Layer of Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, excess retention, amount reinsured	$ 250,000,000.0	295,000,000.0	325,000,000.0
Maximum | 4th Layer of Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention policy, excess retention, amount reinsured		$ 325,000,000.0	$ 350,000,000.0