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Events after the balance sheet date (Details) - Joint ventures - Giampaolo Group $ in Millions	Jul. 21, 2023 USD ($) facility t
Entity Information [Line Items]
Proportion of ownership interest in joint venture (as a percent)	50.00%
Investments in joint ventures | $	$ 700
Recycled aluminium per year (in tonnes) | t	900,000
United States of America
Entity Information [Line Items]
Number of facilities	6
Canada
Entity Information [Line Items]
Number of facilities	1

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The amount of investments in joint ventures in an entity's separate financial statements. [Refer: Joint ventures [member]]

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The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]]

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Production, Recycled Aluminium Per Year

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