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Unpaid Loss and Loss Adjustment Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 01, 2020
Mar. 31, 2021
Mar. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Unpaid loss and LAE at beginning of period   $ 46.3 $ 28.2
Less: Reinsurance recoverable at beginning of period   36.3 18.5
Net unpaid loss and LAE at beginning of period   10.0 9.7
Add: Incurred loss and LAE, net of reinsurance, related to:      
Current year   16.7 14.7
Prior years   (0.2) 3.5
Total incurred   16.5 18.2
Deduct: Paid loss and LAE, net of reinsurance, related to:      
Current year   8.3 8.7
Prior years   3.9 10.3
Total paid   12.2 19.0
Unpaid loss and LAE, gross of reinsurance recoverable, at end of period   14.3 8.9
Reinsurance recoverable at end of period   47.9 22.9
Unpaid loss and LAE, gross of reinsurance recoverable, at end of period   62.2 31.8
Effects of Reinsurance [Line Items]      
Current year   16.7 $ 14.7
Winter Storm Uri      
Add: Incurred loss and LAE, net of reinsurance, related to:      
Current year   6.5  
Effects of Reinsurance [Line Items]      
Current year   $ 6.5  
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%    
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