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Subsequent Events (Details) | Feb. 18, 2020 shares
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Subsequent Events | Common Stock |
Subsequent Event [Line Items] |
Contribution to the Lemonade Foundation (shares) | 500,000

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- Definition Stock Issued During Period, Shares, Issued for Charitable Contribution + References No definition available. + Details
Name: | lmda_StockIssuedDuringPeriodSharesIssuedForCharitableContribution
Namespace Prefix: | lmda_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |