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Employee benefits - Narrative (Details) CLF in Thousands, $ in Thousands			12 Months Ended
	Apr. 25, 2024 CLF	Apr. 25, 2023 CLF	Dec. 31, 2024 USD ($) executive shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Employee benefits [Line Items]
Number of company executives entitled to benefits | executive			41
Net defined benefit liability			$ 26,621	$ 18,428
Key management personnel compensation	CLF 600	CLF 600	$ 8,193	$ 9,933	$ 8,495
Financial target compensation plan
Employee benefits [Line Items]
Key management personnel compensation					$ 2,251
Number of shares effected | shares			188,740
Men
Employee benefits [Line Items]
Actuarial assumption of retirement age (in years)			65 years	65 years	65 years
Men | Top of range
Employee benefits [Line Items]
Actuarial assumption of retirement age (in years)			65 years
Women
Employee benefits [Line Items]
Actuarial assumption of retirement age (in years)			60 years	60 years	60 years
Women | Top of range
Employee benefits [Line Items]
Actuarial assumption of retirement age (in years)			60 years

X

- Definition

The retirement age used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2024-01-01
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- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2024-01-01
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard
-URIDate 2024-03-27

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X

- Definition

The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

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- Definition

Employee benefits [Line Items]

+ References

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- Definition

Number Of Company Executives Entitled To Executive Compensation Benefits

+ References

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- Definition

The number of shares effected in plan.

+ References

No definition available.

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