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Loss and Loss Adjustment Expense Reserves - Incurred and Paid Claims Development (Details)
$ in Millions
Dec. 31, 2023
USD ($)
claim
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Insurance-as-a-Service          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Cumulative Paid Losses and Allocated LAE, Net $ 45.1        
IBNR $ 6.4        
Cumulative Number of Reported Claims | claim 84,913        
Hippo Home Insurance Program          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Cumulative Paid Losses and Allocated LAE, Net $ 313.4        
IBNR $ 66.0        
Cumulative Number of Reported Claims | claim 90,175        
2019 | Insurance-as-a-Service          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Cumulative Paid Losses and Allocated LAE, Net $ 4.9 $ 4.8 $ 4.7 $ 4.8 $ 4.8
IBNR $ 0.0        
Cumulative Number of Reported Claims | claim 7,963        
2019 | Hippo Home Insurance Program          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Cumulative Paid Losses and Allocated LAE, Net $ 0.0 0.0 0.0 0.0 $ 0.0
IBNR $ 0.0        
Cumulative Number of Reported Claims | claim 6,973        
2020 | Insurance-as-a-Service          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Cumulative Paid Losses and Allocated LAE, Net $ 8.9 9.3 7.4 7.6  
IBNR $ 0.1        
Cumulative Number of Reported Claims | claim 16,667        
2020 | Hippo Home Insurance Program          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Cumulative Paid Losses and Allocated LAE, Net $ 20.7 20.6 20.7 $ 20.9  
IBNR $ 0.2        
Cumulative Number of Reported Claims | claim 13,555        
2021 | Insurance-as-a-Service          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Cumulative Paid Losses and Allocated LAE, Net $ 3.5 3.8 6.9    
IBNR $ 0.2        
Cumulative Number of Reported Claims | claim 16,481        
2021 | Hippo Home Insurance Program          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Cumulative Paid Losses and Allocated LAE, Net $ 58.0 59.7 $ 69.9    
IBNR $ 2.6        
Cumulative Number of Reported Claims | claim 24,459        
2022 | Insurance-as-a-Service          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Cumulative Paid Losses and Allocated LAE, Net $ 12.4 13.7      
IBNR $ 0.8        
Cumulative Number of Reported Claims | claim 21,422        
2022 | Hippo Home Insurance Program          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Cumulative Paid Losses and Allocated LAE, Net $ 81.5 $ 80.6      
IBNR $ 30.3        
Cumulative Number of Reported Claims | claim 24,109        
2023 | Insurance-as-a-Service          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Cumulative Paid Losses and Allocated LAE, Net $ 15.4        
IBNR $ 5.3        
Cumulative Number of Reported Claims | claim 22,380        
2023 | Hippo Home Insurance Program          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Cumulative Paid Losses and Allocated LAE, Net $ 153.2        
IBNR $ 32.9        
Cumulative Number of Reported Claims | claim 21,079