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Related Party Transactions (Details)
3 Months Ended 12 Months Ended
Jan. 14, 2021
shares
Mar. 31, 2023
USD ($)
director
$ / shares
shares
Mar. 31, 2022
USD ($)
Dec. 31, 2020
shares
Dec. 31, 2022
USD ($)
Related Party Transaction [Line Items]          
Due to (from) related parties   $ 0     $ 0
Follow-on Offering, Selling Shareholders          
Related Party Transaction [Line Items]          
Common stock sold (in shares) | shares 1,524,314        
The Lemonade Foundation | Follow-on Offering, Selling Shareholders          
Related Party Transaction [Line Items]          
Common stock sold (in shares) | shares 100,000        
Affiliated entity | The Lemonade Foundation          
Related Party Transaction [Line Items]          
Number of shared directors | director   2      
Contribution to the Lemonade Foundation (in shares) | shares   500,000   500,000  
Contribution of common stock to related party, fair value (usd per share) | $ / shares   $ 24.36      
Due from related party   $ 0      
Travel related expenses | Key stockholder          
Related Party Transaction [Line Items]          
Expenses with related parties (less than)   100,000      
Rental expense | Affiliated entity          
Related Party Transaction [Line Items]          
Expenses with related parties (less than)   $ 100,000 $ 100,000