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DEFERRED REVENUE - Changes in Deferred Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue From Contract With Customer [Roll Forward]
Accretion expense - gold prepayment1	$ 9.9	$ 9.3
Revenue from contracts with customers	189.7	$ 179.8	$ 170.5
Current portion of deferred revenue	189.7
Non-current deferred revenue	0.0
Receivables from contracts with customers	$ 189.7

X

- Definition

Accretion Expense, Prepayment on Qualifying Assets

+ References

No definition available.

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- Definition

Revenue From Contract With Customer

+ References

No definition available.

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X

- Definition

The amount of current receivables from contracts with customers. [Refer: Receivables from contracts with customers]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2021-01-01
-Paragraph 105
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- Definition

The amount of non-current receivables from contracts with customers. [Refer: Receivables from contracts with customers]

+ References

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- Definition

The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer that is unconditional. A right to consideration is unconditional if only the passage of time is required before payment of that consideration is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

+ References

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