Insurance Company Subsidiary Operations - Additional Information (Details) $ in Millions		1 Months Ended	6 Months Ended	12 Months Ended		25 Months Ended
	Apr. 28, 2023 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) Reinsurer	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded unpaid loss				$ 125.1	$ 826.2	$ 125.1
Prepaid reinsurance premiums				461.5	393.2	461.5
Increase (decrease) in loss and loss adjustment expense reserve				0.0	0.0
Reinsurance recoverable				125.2	831.0	125.2
Premium net written				61.1	38.3
Net earned premiums				27.7	26.4
Ultimate loss reserve expense inclusive of IBNR claims				131.5	841.1	131.5
Hurricane Ian
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance recoverable				0.1		0.1
Reinsurance recoverable for net expected loss				3.8		3.8
Loss reserve inclusive of IBNR claims				3.9		3.9
Reported insured losses				$ 1.9		$ 1.9
Wright National Flood Insurance Company
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded rate of premiums under insurance program				100.00%		100.00%
Prepaid reinsurance premiums				$ 460.9	381.8	$ 460.9
Expenses and allowance rate received in premiums				29.50%		29.50%		29.70%
Reserve for losses and loss adjustment expense				$ 125.1	826.2	$ 125.1
Number of reinsurers | Reinsurer				2
Premiums written net				$ 886.5	740.9
Statutory capital and surplus required				7.5		7.5
Statutory capital and surplus				39.1	31.8	$ 39.1
Statutory net Income				$ 7.5	1.3
Percentage of adjusted net income				100.00%		100.00%
Maximum dividend payout that may be made without prior approval				$ 3.2		$ 3.2
Dividend paid	$ 3.1
Wright National Flood Insurance Company | Scenario Forecast
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Maximum dividend payout that may be made without prior approval							$ 7.5
Wright National Flood Insurance Company | Maximum
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Preferred stock, dividend rate, percentage				10.00%
Wright National Flood Insurance Company | FEMA
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Premiums written net				$ 883.4	738.0
Quota Share Captive
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Prepaid reinsurance premiums				0.6		0.6
Deferred acquisitions costs				31.0		31.0
Reserve for losses and loss adjustment expense				4.0		4.0
Premium net written				57.6
Premiums written net				52.1	27.1
Net earned premiums				24.2
Initial funding		$ 5.9
Addition to current earnings						2.5
Ultimate loss reserve expense inclusive of IBNR claims				7.2		7.2
Captive Insurance Facility
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Net earned premiums				3.5	5.8
Maximum Underwriting Exposure			$ 3.0
Captive Insurance Facility | Hurricane Ian
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reserve for losses and loss adjustment expense				$ 2.3	$ 4.5	$ 2.3