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Loss and Loss Adjustment Expense Reserves - Reconciliation of Reinsurance Recoverable (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for losses and LAE, net of reinsurance recoverables at end of period $ 101.1 $ 65.0 $ 44.0
Unallocated loss adjustment expense 2.3    
Reinsurance recoverables on unpaid losses and LAE at end of period 221.4 228.8 216.8
Reserve for losses and LAE gross of reinsurance recoverables on unpaid losses and LAE as of end of the period 322.5 $ 293.8 $ 260.8
Insurance-as-a-Service      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for losses and LAE, net of reinsurance recoverables at end of period 10.4    
Recoverables 135.4    
Reinsurance recoverables on unpaid losses and LAE at end of period 135.4    
Reserve for losses and LAE gross of reinsurance recoverables on unpaid losses and LAE as of end of the period 145.8    
Hippo Home Insurance Program      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for losses and LAE, net of reinsurance recoverables at end of period 90.7    
Recoverables 83.7    
Reinsurance recoverables on unpaid losses and LAE at end of period 83.7    
Reserve for losses and LAE gross of reinsurance recoverables on unpaid losses and LAE as of end of the period $ 174.4