v3.26.1
Unpaid Loss and Loss Adjustment Expense - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 01, 2025
Jul. 01, 2024
Jul. 01, 2023
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Effects of Reinsurance [Line Items]            
Favorable development on net loss and LAE reserves         $ (4,000,000.0) $ (10,400,000)
Current accident year incurred loss and LAE         $ 137,300,000 95,800,000
Percent of contracts subject to participation through reinsurance 20.00%          
Reinsurance, excess retention, amount reinsured, per event   $ 10,000,000        
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           $ 16,800,000
Reduction in net unpaid losses       $ (4,200,000)