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Loss and Loss Adjustment Expense Reserves - Reconciliation of Net Incurred and Paid Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Incurred    
Other $ 0.1 $ 0.0
Current year 183.7 113.2
Paid    
Other (0.1) (0.5)
Current year 127.5 56.7
Insurance-as-a-Service    
Incurred    
Development table 15.4 13.7
Unallocated loss adjustment expense 0.9 0.0
Paid    
Development table 7.9 5.0
Unallocated loss adjustment expense 0.9 0.0
Hippo Home Insurance Program    
Incurred    
Development table 153.2 80.6
Unallocated loss adjustment expense 14.1 18.9
Paid    
Development table 104.7 33.3
Unallocated loss adjustment expense $ 14.1 $ 18.9