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Loss and Loss Adjustment Expense Reserves - Reconciliation of Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
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 $ 350.0 $ 322.5
Reinsurance recoverables on unpaid losses and LAE (229.9) (221.4)
Reserve for losses and LAE, net of reinsurance recoverables as of beginning of the period 120.1 101.1
Add: Incurred losses and LAE, net of reinsurance, related to:    
Current year 95.4 52.6
Prior years (3.0) 0.0
Total incurred 92.4 52.6
Deduct: Loss and LAE payments, net of reinsurance, related to:    
Current year 50.3 20.3
Prior year 26.8 22.2
Total paid 77.1 42.5
Reserve for losses and LAE, net of reinsurance recoverables at end of period 135.4 111.2
Add: Reinsurance recoverables on unpaid losses and LAE at end of period 265.4 225.4
Reserve for losses and LAE gross of reinsurance recoverables on unpaid losses and LAE as of end of the period 400.8 $ 336.6
Attritional reserves release 2.9  
Catastrophe reserves release $ 0.1