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Unpaid Loss and Loss Adjustment Expense - Additional Information (Details) - USD ($)
1 Months Ended 9 Months Ended
Jul. 01, 2025
Jul. 01, 2024
Jul. 01, 2023
Mar. 31, 2025
Sep. 30, 2025
Sep. 30, 2024
Effects of Reinsurance [Line Items]            
Favorable development on net loss and LAE reserves         $ (18,900,000) $ (6,300,000)
Current accident year incurred loss and LAE         271,400,000 $ 220,600,000
Reinsurance, excess retention, amount reinsured, per event   $ 10,000,000        
Percent of contracts subject to participation through reinsurance 20.00%          
Reinsurance, per risk limit, amount   750,000        
Cession rate percentage     35.00%      
Reinsurance Contract [Axis]: Excess of Loss Reinsurance Contract            
Effects of Reinsurance [Line Items]            
Reinsurance, excess retention, amount reinsured, per event   80,000,000        
Initial limit for each loss occurrence   50,000,000,000,000        
Reinsurance Contract [Axis]: Property Per Risk Excess of Loss Reinsurance            
Effects of Reinsurance [Line Items]            
Reinsurance, excess retention, amount reinsured, per policy   $ 2,250,000        
Reinsurance, excess retention, percentage   100.00%        
Reinsurance Contract [Axis]: Reinsurance Program            
Effects of Reinsurance [Line Items]            
Percent of contracts subject to participation through reinsurance   55.00%        
Lemonade Insurance Company | Reinsurance Contract [Axis]: Automatic Facultative Property Per Risk Excess of Loss            
Effects of Reinsurance [Line Items]            
Reinsurance, excess retention, amount reinsured, per policy     $ 3,000,000      
Lemonade Insurance Company | Reinsurance Contract [Axis]: Automatic Facultative Property Per Risk Excess of Loss Reinsurance            
Effects of Reinsurance [Line Items]            
Reinsurance, excess retention, amount reinsured, per policy     $ 10,000,000      
Reinsurance, excess retention, percentage     100.00%      
Maximum | Reinsurance Contract [Axis]: Property Per Risk Excess of Loss Reinsurance            
Effects of Reinsurance [Line Items]            
Reinsurance, excess retention, amount reinsured, per policy   $ 750,000        
California Wildfires            
Effects of Reinsurance [Line Items]            
Current accident year incurred loss and LAE         $ 19,900,000  
Reduction in net unpaid losses       $ 4,200,000