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Loss and Loss Adjustment Expense Reserves (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Reserve for losses and LAE gross of reinsurance recoverables on unpaid losses and LAE as of beginning of the period     $ 293.8 $ 260.8  
Less: Reinsurance recoverables on unpaid losses and LAE     (228.8) (217.0)  
Reserve for losses and LAE, net of reinsurance recoverables as of beginning of the period     65.0 43.8  
Add: Incurred losses and LAE, net of reinsurance, related to:          
Current year     153.0 84.9  
Prior years     (2.1) (9.3)  
Total incurred $ 36.5 $ 23.9 150.9 75.6  
Deduct: Loss and LAE payments, net of reinsurance, related to:          
Current year     89.8 45.9  
Prior years     15.7 15.7  
Total paid     105.5 61.6  
Reserve for losses and LAE, net of reinsurance recoverables at end of period 110.4 57.8 110.4 57.8  
Add: Reinsurance recoverables on unpaid losses and LAE at end of period 249.5 263.7 249.5 263.7  
Reserve for losses and LAE gross of reinsurance recoverables on unpaid losses and LAE as of end of the period $ 359.9 321.5 $ 359.9 321.5  
Attritional reserves release   5.0   5.0 $ 1.1
Catastrophe reserves release   $ 4.3   $ 4.3 $ 1.0