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LEASES - Lease liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disclosure of leases [Roll Forward]
Balance, beginning of year	$ 121.3	$ 73.8
Additions	34.1	79.7
Interest expense	8.4	7.5
Foreign exchange impact	(11.0)	1.0
Principal lease payments	(20.6)	(6.0)
Interest payments	(8.0)	(5.3)
UJV lease adjustment	0.0	(29.4)
Balance, end of year	124.2	121.3
Current portion	28.8	21.1
Non-current portion	95.4	100.2
Lease obligations	$ 124.2	$ 121.3

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- Definition

Disclosure of leases [Roll Forward]

+ References

No definition available.

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- Definition

Foreign Exchange Gain (Loss) on Lease

+ References

No definition available.

+ Details

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- Definition

Interest Payments Of Lease Liabilities

+ References

No definition available.

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- Definition

Joint Operation Lease Adjustment

+ References

No definition available.

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- Definition

Principle Payments of Lease Liabilities

+ References

No definition available.

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- Definition

The amount of additions to right-of-use assets. [Refer: Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph h
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-URIDate 2024-03-27

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- Definition

The amount of current lease liabilities. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 47
-Subparagraph b
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-URIDate 2024-03-27

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- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_b&doctype=Standard
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- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2024-01-01
-Paragraph 47
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- Definition

The amount of non-current lease liabilities. [Refer: Lease liabilities]

+ References

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