XML 48 R38.htm IDEA: XBRL DOCUMENT
v3.25.2

Earnings Per Share - Narrative (Details) | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Class B common stock |  |
Reconciliation of the numerators and denominators used in the basic and diluted per-share computations |  |
Ratio for converting shares of Class B common stock into shares of Class A common stock | 2,400 | 2,400

X
- Definition The ratio applied to Class B common stock shares for purposes of determining the number of Class A common stock shares into which the stock will be converted (the number of Class A common stock shares into which one Class B common stock share may be converted). + References No definition available. + Details
Name: | erie_CommonStockConversionRatio
Namespace Prefix: | erie_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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: | erie_ScheduleOfEarningsPerShareBasicAndDilutedLineItems
Namespace Prefix: | erie_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |