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Loss and Loss Adjustment Expense Reserves - Reconciliation of Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
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
Reinsurance recoverables on unpaid losses and LAE (228.8) (216.8)
Reserve for losses and LAE, net of reinsurance recoverables as of beginning of the period 65.0 44.0
Add: Incurred losses and LAE, net of reinsurance, related to:    
Current year 183.7 113.2
Prior years (2.0) (11.8)
Total incurred 181.7 101.4
Deduct: Loss and LAE payments, net of reinsurance, related to:    
Current year 127.5 56.7
Prior year 18.1 23.7
Total paid 145.6 80.4
Reserve for losses and LAE, net of reinsurance recoverables at end of period 101.1 65.0
Add: Reinsurance recoverables on unpaid losses and LAE at end of period 221.4 228.8
Reserve for losses and LAE gross of reinsurance recoverables on unpaid losses and LAE as of end of the period 322.5 293.8
Catastrophe reserves release $ 2.1 6.0
Attritional reserves release   $ 5.8