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Unpaid Loss and Loss Adjustment Expense - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 01, 2024
Jul. 01, 2023
Mar. 31, 2025
Mar. 31, 2025
Mar. 31, 2024
Effects of Reinsurance [Line Items]          
Favorable development on net loss and LAE reserves       $ (10,400,000) $ (6,500,000)
Current accident year incurred loss and LAE       95,800,000 $ 72,400,000
Reinsurance, excess retention, amount reinsured, per event $ 10,000,000 $ 5,000,000      
Reinsurance, per risk limit, amount   750,000      
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]: Proportional Reinsurance Contracts          
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