Unpaid Loss and Loss Adjustment Expense - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Unusual or Infrequent Item, or Both [Line Items]
Favorable development on net loss and LAE reserves	$ (3.2)	$ (1.3)
Current accident year incurred loss and LAE	170.5	73.2
Home and renters
Unusual or Infrequent Item, or Both [Line Items]
Accident amount	0.1	0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.1
IBNR, net of reinsurance	0.1			0.1	0.1	0.1	0.1
Cumulative paid loss and ALAE, net of reinsurance	0.1	0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.1
Hurricane Ian
Unusual or Infrequent Item, or Both [Line Items]
Current accident year incurred loss and LAE	0.4
Winter Storm Elliott
Unusual or Infrequent Item, or Both [Line Items]
Current accident year incurred loss and LAE	$ 7.6
Winter Storm Uri
Unusual or Infrequent Item, or Both [Line Items]
Current accident year incurred loss and LAE		6.9
Colorado Wildfires
Unusual or Infrequent Item, or Both [Line Items]
Current accident year incurred loss and LAE		$ 0.8