Insurance Company Subsidiary Operations - Additional Information (Details) $ in Millions		1 Months Ended	6 Months Ended	12 Months Ended	19 Months Ended
	Apr. 28, 2023 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2023 USD ($) Reinsurer	Dec. 31, 2022 USD ($)	Jun. 30, 2023 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded rate of premiums under insurance program			100.00%		100.00%
Ceded unpaid loss			$ 184.6		$ 184.6
Prepaid reinsurance premiums			450.6	$ 393.2	450.6
Increase (decrease) in loss and loss adjustment expense reserve			0.0
Reinsurance recoverable			187.2	831.0	187.2
Reserve for losses and loss adjustment expense			$ 184.6		184.6
Number of reinsurers | Reinsurer			2
Premium net written			$ 34.9
Net earned premiums			21.7
Ultimate loss reserve expense inclusive of IBNR claims			198.8	841.1	198.8
Hurricane Ian
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance recoverable			2.7		2.7
Reinsurance recoverable for net expected loss			4.9		4.9
Loss reserve inclusive of IBNR claims			7.6		7.6
Reported insured losses			$ 2.1		$ 2.1
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			$ 416.0		$ 416.0
Expenses and allowance rate received in premiums			29.70%		29.70%
Premiums written net			$ 412.1
Ceded to highly rated carriers for excess flood policies			1.5
Statutory capital and surplus required			7.5		$ 7.5
Statutory capital and surplus			38.0	31.8	$ 38.0
Statutory net Income			$ 7.8	$ 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 | 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			$ 410.6
Quota Share Captive
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Prepaid reinsurance premiums			34.6		34.6
Deferred acquisitions costs			31.6		31.6
Reinsurance payable			17.0		17.0
Reserve for losses and loss adjustment expense			7.9		7.9
Premiums written net			41.0
Premium net written			33.3
Net earned premiums			20.1
Initial funding		$ 5.9
Addition to current earnings					18.3
Ultimate loss reserve expense inclusive of IBNR claims			9.3		9.3
Captive Insurance Facility
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reserve for losses and loss adjustment expense			6.3		6.3
Net earned premiums			1.6
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			$ 6.0		$ 6.0