Unpaid Loss and Loss Adjustment Expense - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Unusual or Infrequent Item, or Both [Line Items]
Favorable (unfavorable) development on net loss and LAE reserves	$ (1.3)	$ (0.1)
Current accident year incurred loss and LAE	73.2	$ 54.8
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