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Loss and Loss Adjustment Expense Reserves - Cumulative Paid Losses and LAE (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Liability for Claims and Claims Adjustment Expense [Line Items]          
Ceded unpaid loss and LAE $ 221.4 $ 228.8 $ 216.8    
Gross unpaid loss and LAE 322.5 293.8 260.8    
Insurance-as-a-Service          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Total paid losses and LAE, net 35.0        
Total unpaid loss and LAE reserves, net 10.1        
Unpaid loss and LAE reserves for years prior to 2019, net 0.3        
Ceded unpaid loss and LAE 135.4        
Gross unpaid loss and LAE 145.8        
Hippo Home Insurance Program          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Total paid losses and LAE, net 222.7        
Total unpaid loss and LAE reserves, net 90.7        
Ceded unpaid loss and LAE 83.7        
Gross unpaid loss and LAE 174.4        
2019 | Insurance-as-a-Service          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Total paid losses and LAE, net 4.7 4.7 4.6 $ 4.4 $ 3.2
2019 | Hippo Home Insurance Program          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Total paid losses and LAE, net 0.0 0.0 0.0 0.0 $ 0.0
2020 | Insurance-as-a-Service          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Total paid losses and LAE, net 8.6 8.4 8.0 4.6  
2020 | Hippo Home Insurance Program          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Total paid losses and LAE, net 20.2 20.1 18.8 $ 12.5  
2021 | Insurance-as-a-Service          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Total paid losses and LAE, net 3.1 2.8 0.4    
2021 | Hippo Home Insurance Program          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Total paid losses and LAE, net 54.3 53.0 $ 34.9    
2022 | Insurance-as-a-Service          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Total paid losses and LAE, net 10.7 5.0      
2022 | Hippo Home Insurance Program          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Total paid losses and LAE, net 43.5 $ 33.3      
2023 | Insurance-as-a-Service          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Total paid losses and LAE, net 7.9        
2023 | Hippo Home Insurance Program          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Total paid losses and LAE, net $ 104.7