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Unpaid Loss and Loss Adjustment Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]              
Unpaid loss and LAE at beginning of period       $ 28.2 $ 13.1 $ 13.1 $ 2.1
Less: Reinsurance recoverable at beginning of period       18.5 11.3 11.3 2.0
Net unpaid loss and LAE at beginning of period       9.7 1.8 1.8 0.1
Add: Incurred loss and LAE, net of reinsurance, related to:              
Current year       44.1 32.2 47.3 15.2
Prior years       1.3 (1.8) (1.5) 0.0
Net losses and LAE incurred   $ 6.7 $ 12.6 45.4 30.4 45.8 15.2
Deduct: Paid loss and LAE, net of reinsurance, related to:              
Current year       36.4 36.0 37.7 13.4
Prior years       11.0   0.2 0.1
Prior years         (12.0)    
Total paid       47.4 24.0 37.9 13.5
Unpaid loss and LAE, gross of reinsurance recoverable, at end of period   7.7 8.2 7.7 8.2 9.7 1.8
Reinsurance recoverable at end of period   32.0 16.4 32.0 16.4 18.5 11.3
Unpaid loss and LAE, gross of reinsurance recoverable, at end of period   $ 39.7 $ 24.6 39.7 24.6 28.2 $ 13.1
Effects of Reinsurance [Line Items]              
(Unfavorable) favorable development on net loss and LAE reserve       $ (1.3) $ 1.8 $ 1.5  
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