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Financial risk management and derivative financial instruments - Summary of Amended Covenant Test Levels For Syndicated and Bilateral Facilities (Detail)	12 Months Ended
	Dec. 31, 2024
Minimum [Member]
Amended covenant test levels for revolving credit facility [Line Items]
Interest cover	3.5
Maximum [Member]
Amended covenant test levels for revolving credit facility [Line Items]
Leverage	4

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- Definition

Amended covenant test levels for revolving credit facility.

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- Definition

Interest cover ratio.

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- Definition

Leverage ratio.

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