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Unpaid Loss and Loss Adjustment Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 01, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Unpaid loss and LAE at beginning of period $ 64.7     $ 46.3 $ 28.2
Less: Reinsurance recoverable at beginning of period 49.7     36.3 18.5
Net unpaid loss and LAE at beginning of period $ 15.0     10.0 9.7
Add: Incurred loss and LAE, net of reinsurance, related to:          
Current year       29.9 33.5
Prior years       (0.4) 5.2
Total incurred   $ 13.0 $ 20.5 29.5 38.7
Deduct: Paid loss and LAE, net of reinsurance, related to:          
Current year       19.0 24.4
Prior years       5.5 13.2
Total paid       24.5 37.6
Unpaid loss and LAE, gross of reinsurance recoverable, at end of period   15.0 10.8 15.0 10.8
Reinsurance recoverable at end of period   49.7 24.5 49.7 24.5
Unpaid loss and LAE, gross of reinsurance recoverable, at end of period   $ 64.7 $ 35.3 64.7 35.3
Effects of Reinsurance [Line Items]          
Current year       29.9 $ 33.5
Winter Storm Uri          
Add: Incurred loss and LAE, net of reinsurance, related to:          
Current year       6.2  
Effects of Reinsurance [Line Items]          
Current year       $ 6.2  
Proportional Reinsurance Contracts          
Effects of Reinsurance [Line Items]          
Percent of contracts subject to participation through reinsurance       75.00%  
Ceded commission percentage       25.00%  
Claims funding percentage   75.00%   75.00%  
Proportional Reinsurance Contracts | Subsequent event          
Effects of Reinsurance [Line Items]          
Percent of contracts subject to participation through reinsurance 70.00%        
Proportional Reinsurance Contracts, Tranche One          
Effects of Reinsurance [Line Items]          
Reinsurance contract, term       3 years  
Proportional Reinsurance Contracts, Tranche Two          
Effects of Reinsurance [Line Items]          
Reinsurance contract, term       1 year  
Non-Proportional Reinsurance Contracts          
Effects of Reinsurance [Line Items]          
Percent of contracts subject to participation through reinsurance       25.00%  
Reinsurance contract, term       1 year