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PENSION, POST-RETIREMENT AND POST-EMPLOYMENT PLANS - Supplemental Executive Retirement Plans (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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SERP |  |
Defined Benefit Plan Disclosure |  |
Projected benefit obligation | $ 5.0 | $ 5.8

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=esi_SupplementalExecutiveRetirementPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |