XML 82 R61.htm IDEA: XBRL DOCUMENT
v3.25.4

Reinsurance - Additional Information (Details) - USD ($) | Jul. 01, 2024 | Jun. 30, 2024 | Jul. 01, 2023
--- | --- | --- | ---
Effects of Reinsurance [Line Items] |  |  |
Reinsurance, excess retention, amount |  |  | $ 10,000,000
Reinsurance, per risk limit, amount |  |  | $ 750,000
Cession rate percentage |  |  | 35.00%
Reinsurance Contract [Axis]: Automatic Facultative Property Per Risk Excess of Loss | Lemonade Insurance Company |  |  |
Effects of Reinsurance [Line Items] |  |  |
Reinsurance, excess retention, amount reinsured, per policy |  | $ 3,000,000 |
Reinsurance Contract [Axis]: Automatic Facultative Property Per Risk Excess of Loss Reinsurance | Lemonade Insurance Company |  |  |
Effects of Reinsurance [Line Items] |  |  |
Reinsurance, excess retention, amount reinsured, per policy |  | $ 10,000,000 |
Reinsurance, excess retention, percentage |  | 100.00% |
Reinsurance Contract [Axis]: Excess of Loss Reinsurance Contract |  |  |
Effects of Reinsurance [Line Items] |  |  |
Reinsurance, excess retention, amount |  |  | $ 80,000,000
Reinsurance, amount retained, per event |  |  | 50,000,000,000,000
Reinsurance Contract [Axis]: Property Per Risk Excess of Loss Reinsurance |  |  |
Effects of Reinsurance [Line Items] |  |  |
Reinsurance, excess retention, amount reinsured, per policy |  |  | $ 2,250,000
Reinsurance, excess retention, percentage |  |  | 100.00%
Reinsurance Contract [Axis]: Property Per Risk Excess of Loss Reinsurance | Maximum |  |  |
Effects of Reinsurance [Line Items] |  |  |
Reinsurance, excess retention, amount reinsured, per policy |  |  | $ 750,000
Reinsurance Contract [Axis]: Proportional Reinsurance Contracts |  |  |
Effects of Reinsurance [Line Items] |  |  |
Percent of contracts subject to participation through reinsurance |  |  | 20.00%
Reinsurance Contract [Axis]: Reinsurance Program |  |  |
Effects of Reinsurance [Line Items] |  |  |
Percent of contracts subject to participation through reinsurance | 55.00% |  |

X
- Definition Percentage Of Deferred Reinsurance Ceding Commissions + References No definition available. + Details
Name: | lmnd_PercentageOfDeferredReinsuranceCedingCommissions
Namespace Prefix: | lmnd_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reinsurance, Per Risk Limit, Amount + References No definition available. + Details
Name: | lmnd_ReinsurancePerRiskLimitAmount
Namespace Prefix: | lmnd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Ratio of insurance contracts that are subject to reinsurance participation to all contracts in force. + References No definition available. + Details
Name: | us-gaap_ContractsInForceSubjectToParticipationThroughReinsurancePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_EffectsOfReinsuranceLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount per event of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-3 + Details
Name: | us-gaap_ReinsuranceRetentionAmountRetainedPerEvent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount per event of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-3 + Details
Name: | us-gaap_ReinsuranceRetentionExcessRetentionAmountReinsuredPerEvent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount per policy of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-3 + Details
Name: | us-gaap_ReinsuranceRetentionExcessRetentionAmountReinsuredPerPolicy
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-3 + Details
Name: | us-gaap_ReinsuranceRetentionPolicyExcessRetentionPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ReinsuranceContractAxis=Automatic Facultative Property Per Risk Excess of Loss
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=lmnd_LemonadeInsuranceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReinsuranceContractAxis=Automatic Facultative Property Per Risk Excess of Loss Reinsurance
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReinsuranceContractAxis=Excess of Loss Reinsurance Contract
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReinsuranceContractAxis=Property Per Risk Excess of Loss Reinsurance
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReinsuranceContractAxis=Proportional Reinsurance Contracts
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReinsuranceContractAxis=Reinsurance Program
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |