Insurance Company Subsidiary Operations - Additional Information (Details) $ in Millions		1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended	28 Months Ended
	Apr. 28, 2023 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2024 USD ($) Reinsurer	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded rate of premiums under insurance program			100.00%			100.00%
Ceded unpaid loss			$ 65.0			$ 65.0
Prepaid reinsurance premiums			428.0		$ 462.0	428.0
Increase (decrease) in loss and loss adjustment expense reserve			0.0
Reinsurance recoverable			65.0		125.0	65.0
Reserve for losses and loss adjustment expense			$ 65.0			65.0
Number of reinsurers | Reinsurer			2
Premium net written			$ 20.0
Net earned premiums			10.0
Ultimate loss reserve expense inclusive of IBNR claims			72.0		131.0	72.0
Hurricane Ian
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Loss reserve inclusive of IBNR claims			3.0			3.0
Reported insured losses			$ 2.0			$ 2.0
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			$ 428.0			$ 428.0
Expenses and allowance rate received in premiums			29.50%			29.50%
Premiums written net			$ 190.0
Ceded to highly rated carriers for excess flood policies			1.0
Statutory capital and surplus required			8.0			$ 8.0
Statutory capital and surplus			40.0		39.0	$ 40.0
Statutory net Income					$ 7.0
Statutory net loss			$ 0.3
Percentage of adjusted net income			100.00%			100.00%
Maximum dividend payout that may be made without prior approval			$ 7.0			$ 7.0
Dividend paid	$ 3.0
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			$ 189.0
Quota Share Captive
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Deferred acquisitions costs			37.0			37.0
Reserve for losses and loss adjustment expense			4.0			4.0
Premiums written net			18.0
Premium net written			19.0
Net earned premiums			10.0
Initial funding		$ 6.0
Addition to earnings						1.0
Ultimate loss reserve expense inclusive of IBNR claims			$ 8.0			$ 8.0
Captive Insurance Facility
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Maximum aggregate annual underwriting exposure				$ 3.0