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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 14, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2023 | Dec. 31, 2022 | Jul. 07, 2020
Sale of Stock [Line Items] |  |  |  |  |  |
Common stock, authorized (in shares) |  |  |  | 200,000,000 | 200,000,000 | 200,000,000
Common stock, par value (usd per share) |  |  |  | $ 0.00001 | $ 0.00001 | $ 0.00001
Preferred stock, authorized (in shares) |  |  |  | 10,000,000 | 10,000,000 | 10,000,000
Preferred stock, par value (usd per share) |  |  |  | $ 0.00001 | $ 0.00001 | $ 0.00001
Preferred stock, issued (in shares) |  |  |  | 0 | 0 |
Preferred stock, outstanding (in shares) |  |  |  | 0 | 0 |
Omnibus Agreement |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |
Class of warrant common stock exercise price (usd per share) | $ 0.01 |  |  |  |  |
Vesting period | 5 years |  |  |  |  |
The Lemonade Foundation | Affiliated entity |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |
Contribution to the Lemonade Foundation (in shares) |  |  | 500,000 |  |  |
Follow-on Offering |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |
Common stock sold (in shares) |  | 3,300,000 |  |  |  |
Net proceeds from sale |  | $ 525.7 |  |  |  |
Follow-on Offering, Selling Shareholders |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |
Common stock sold (in shares) |  | 1,524,314 |  |  |  |
Underwriter's option |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |
Common stock sold (in shares) |  | 718,647 |  |  |  |
Net proceeds from sale |  | $ 114.6 |  |  |  |

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