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Cash and cash equivalents (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
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