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Related Party Transactions (Details)
12 Months Ended
Feb. 18, 2020
shares
Dec. 31, 2022
USD ($)
director
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
shares
Related Party Transaction [Line Items]        
Due to (from) related parties   $ 0 $ 0  
Common shares contribution to Lemonade Foundation   $ 0 0 $ 12,200,000
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
Common shares contribution to Lemonade Foundation       $ 12,200,000
Due from related party   $ 0 0  
Travel related expenses | Key stockholder        
Related Party Transaction [Line Items]        
Expenses with related parties (less than)   200,000 100,000 100,000
Rental expense | Affiliated entity        
Related Party Transaction [Line Items]        
Expenses with related parties (less than)   $ 100,000 $ 100,000 $ 100,000