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v3.23.3

Fair Value Measurements - Change in Fair Value of Warrant (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2023 USD ($)
Warrants Roll Forward [Abstract] |
Warrants beginning balance | $ 0.3
Change in fair value | (0.3)
Warrants ending balance | 0.0
Fair value of warrant liability (less than) | $ 0.1

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- Definition Warrants And Rights Outstanding, Fair Value Disclosure + References No definition available. + Details
Name: | lmnd_WarrantsAndRightsOutstandingFairValueDisclosure
Namespace Prefix: | lmnd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Warrants and Rights, Period Increase (Decrease) + References No definition available. + Details
Name: | lmnd_WarrantsAndRightsPeriodIncreaseDecrease
Namespace Prefix: | lmnd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Warrants Roll Forward + References No definition available. + Details
Name: | lmnd_WarrantsRollForwardAbstract
Namespace Prefix: | lmnd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
Name: | us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant