Revenue and expenses (Schedule of detailed information about revenue) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Analysis of income and expense [abstract]
Copper	$ 1,161.5	$ 1,154.8
Gold	794.4	673.6
Zinc	43.5	71.1
Silver	53.6	51.5
Molybdenum	63.9	60.1
Other	0.0	1.7
Revenue from contracts	2,116.9	2,012.8
Non-cash streaming arrangement items
Amortization of deferred revenue - gold	31.3	40.7
Amortization of deferred revenue - silver	33.8	33.6
Amortization of deferred revenue - variable consideration adjustments - prior periods	9.9	(3.8)
Amortization of deferred revenue	75.0	70.5
Pricing and volume adjustments	47.5	35.2
Revenue excluding treatment and refining charges	2,239.4	2,118.5
Treatment and refining charges	(28.4)	(97.3)
Revenue	$ 2,211.0	$ 2,021.2

Amortization of deferred revenue.

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The amount of amortization of deferred revenue - gold.

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The amount of amortization of deferred revenue - silver.

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Revenue excluding treatment and refining charges.

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The amount of revenue arising from the sale of Molybdenum.

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Revenue from sale of zinc.

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Treatment and refining charges

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The increase (decrease) in contract liabilities resulting from cumulative catch-up adjustments to revenue arising from a change in an estimate of the transaction price. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Increase (decrease) through cumulative catch-up adjustments to revenue, contract liabilities]

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The increase (decrease) in contract liabilities resulting from cumulative catch-up adjustments to revenue arising from a contract modification. A contract modification is a change in the scope or price (or both) of a contract that is approved by the parties to the contract. [Refer: Increase (decrease) through cumulative catch-up adjustments to revenue, contract liabilities]

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