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v3.25.1

Revenue - Narrative (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 USD ($) obligation | Mar. 31, 2024 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Management fee rate as a percent of direct and affiliated assumed written premiums of the exchange | 25.00% |
Performance obligations under subscriber's agreement | obligation | 2 |
Revenue recognized | $ | $ 15.4 | $ 15.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Performance obligation, satisfaction period | 4 years |

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- Definition Represents the management fee rate, determined by the board of directors of the entity, calculated as a percentage of the direct and affiliated assumed written premiums. + References No definition available. + Details
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Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of performance obligations recognized by Indemnity acting as attorney-in-fact for the subscribers of the Exchange in accordance with Topic 606. + References No definition available. + Details
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Namespace Prefix: | erie_
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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Period Type: | duration

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- 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
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- Definition Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(1) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
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- Details
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