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Stockholders' Equity (Details) - $ / shares
Feb. 18, 2020
Jun. 30, 2020
Dec. 31, 2019
Equity [Abstract]      
Common stock, authorized (shares)   52,000,000 52,000,000
Common stock, par value (usd per share)   $ 0.00001 $ 0.00001
Affiliated entity | The Lemonade Foundation      
Related Party Transaction [Line Items]      
Contribution to the Lemonade Foundation (shares) 500,000