Deferred Revenue - (Summary of Deferred Revenue) (Details) $ in Millions	12 Months Ended
Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Deferred Revenue1 [Abstract]
Deferred revenue, beginning balance	$ 116.6	$ 0.0
Advanced consideration from gold sale prepayment agreement, net of transaction costs		111.1
Accretion expense		5.5
Deferred revenue recognized	(124.6)
Deferred revenue, ending balance	$ 50.0	$ 116.6

The amount of current deferred income including current contract liabilities. [Refer: Deferred income including contract liabilities]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 78
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_78&doctype=Standard
-URIDate 2025-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant