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Reinsurance - Narrative (Details)
$ in Millions
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Effects of Reinsurance [Line Items]    
Provision for sliding scale commission $ 27.8 $ 34.2
Receivable for sliding scale commission 14.7 3.6
Provision for loss participation feature $ 33.7 $ 41.6
Reinsurance Policy, Type [Axis]: Non-Proportional Reinsurance — Hippo Home Insurance Program    
Effects of Reinsurance [Line Items]    
Excess retention, year return period, ratio 0.004  
Reinsurance Policy, Type [Axis]: Other Reinsurance - Corporate Catastrophe Excess of Loss Catastrophe Coverage    
Effects of Reinsurance [Line Items]    
Excess retention, year return period, ratio 0.004  
Reinsurance Policy, Type [Axis]: Other Reinsurance - Corporate Excess of Loss Catastrophe Coverage    
Effects of Reinsurance [Line Items]    
Excess retention, year return period, ratio 0.004