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v3.21.1

Related Party Transactions (Details) - Affiliated Entity - Advisory Services Agreement - Mariposa Capital $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($)
Related Party Transaction |
Related party transaction expense | $ 3
Automatic renewal period | 1 year
Agreement renewal period | 90 days

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- Definition Related Party, Automatic Renewal Period + References No definition available. + Details
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Namespace Prefix: | esi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The length of time to give notice to not renew a related party agreement. + References No definition available. + Details
Name: | esi_RelatedPartyNoticeOfNonRenewalToAgreement
Namespace Prefix: | esi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=esi_AdvisoryServicesAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=esi_MariposaCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |