Insurance Company Subsidiary Operations - Additional Information (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) Reinsurer	Dec. 31, 2021 USD ($)	Dec. 30, 2021 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded rate of premiums under insurance program	100.00%
Ceded unpaid loss	$ 38.4
Prepaid reinsurance premiums	362.4	$ 392.2
Increase (decrease) in loss and loss adjustment expense reserve	0.0
Reserve for losses and loss adjustment expense	$ 38.4
Number of reinsurers | Reinsurer	2
Premium net written	$ 11.5
Net earned premiums	$ 1.1
Wright National Flood Insurance Company
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded rate of premiums under insurance program	100.00%
Expenses and allowance rate received in premiums	29.90%
Premiums written net	$ 157.6
Ceded to highly rated carriers for excess flood policies	0.5
Statutory capital and surplus required	7.5
Statutory capital and surplus	35.2	33.1
Statutory net Income	$ 0.3		$ 1.6
Percentage of adjusted net income	100.00%
Maximum dividend payout that may be made without prior approval	$ 3.3
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	$ 157.1
Captive Insurance Facility
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Premiums written net	8.0
Premium net written	11.5
Net earned premiums	$ 1.1
Initial funding		5.9
Addition to current earnings		$ 0.7