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Postretirement Benefits - Employee Savings Plan (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Employee savings plan |  |  |
Employer matching contribution paid to the plan | $ 21.0 | $ 18.4 | $ 16.7
Class A common stock held by plan participants (in shares) | 0.1 | 0.1 |
Erie Insurance Exchange (EIE) |  |  |
Employee savings plan |  |  |
Matching contributions reimbursed to Indemnity from the Exchange and its subsidiaries (as a percent) | 61.00% |  |
100% employer matching contribution |  |  |
Employee savings plan |  |  |
Percentage of employer matching contribution of employee contributions | 100.00% |  |
100% employer matching contribution | Maximum |  |  |
Employee savings plan |  |  |
Percentage of eligible employee compensation, matched by employer | 3.00% |  |
50% employer matching contribution |  |  |
Employee savings plan |  |  |
Percentage of employer matching contribution of employee contributions | 50.00% |  |
50% employer matching contribution | Maximum |  |  |
Employee savings plan |  |  |
Percentage of eligible employee compensation, matched by employer | 5.00% |  |
50% employer matching contribution | Minimum |  |  |
Employee savings plan |  |  |
Percentage of eligible employee compensation, matched by employer | 3.00% |  |

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- Definition Represents the percentage at which 401(k) matching contributions are reimbursed to the attorney-in-fact. + References No definition available. + Details
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- Definition The number of employer shares or related party shares included in the defined contribution plan assets. + References No definition available. + Details
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- Definition [Line Items] for Schedule of Defined Contribution Plans Disclosures [Table] + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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