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Cash and cash equivalents (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
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Cash and Cash Equivalents [Abstract] |  |
Cash and cash equivalents held by subsidiaries | $ 19.9 | $ 9.1

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- Definition Cash and Cash Equivalents, At Carrying Value, Held By Subsidiaries + References No definition available. + Details
Name: | ie_CashAndCashEquivalentsAtCarryingValueHeldBySubsidiaries
Namespace Prefix: | ie_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration