Amount of allowance for credit loss on accounts receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Name:	us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Concentrations of Credit Risk (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2020
Concentration Risk [Line Items]
Receivables from Erie Insurance Exchange and its affiliates	$ 524.9	$ 479.1
Receivables from Erie Insurance Exchange, allowance for credit loss	$ 0.6	$ 0.5
Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2016-13
Concentration Risk [Line Items]
Receivables from Erie Insurance Exchange, allowance for credit loss			$ 0.6