Derivative Financial Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Detailed Information about Derivative Financial Assets Explanatory [Line Items]
Derivative financial assets held for hedging	$ 5.1	$ 113.3
Non-current derivative financial assets	0.0	(31.4)
Derivative financial assets	5.1	81.9
Australian gold derivative contracts
Disclosure Of Detailed Information about Derivative Financial Assets Explanatory [Line Items]
Derivative financial assets held for hedging	2.0	27.3
Salares Norte foreign currency derivative contracts
Disclosure Of Detailed Information about Derivative Financial Assets Explanatory [Line Items]
Derivative financial assets held for hedging	0.0	86.0
Ghanaian oil derivative contracts
Disclosure Of Detailed Information about Derivative Financial Assets Explanatory [Line Items]
Derivative financial assets held for hedging	$ 3.1	$ 0.0

Disclosure of detailed information about derivative financial assets explanatory [Line items].

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- Definition

The amount of current derivative financial assets. [Refer: Derivative financial assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 55
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-URIDate 2021-03-24

+ Details

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- Definition

The amount of derivative financial assets held for hedging. [Refer: Derivative financial assets]

+ References

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- Definition

The amount of non-current derivative financial assets. [Refer: Derivative financial assets]

+ References

+ Details

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