REVENUE: - Receivables by reporting segment (Details) $ in Millions	6 Months Ended
Jun. 30, 2025 USD ($) T	Dec. 31, 2024 USD ($)
Opening and closing balances of receivables
Trade receivables	$ 1,557.7	$ 1,189.6
Related parties receivable current:	14.8	13.5
Operating segment
Opening and closing balances of receivables
Trade receivables	1,557.7	1,189.6
Related parties receivable current:	46.5	66.2
Corporate & Elimination
Opening and closing balances of receivables
Related parties receivable current:	$ (31.7)	(52.7)
Copper concentrates
Long Term Contracts
Long term contracts \| T	215,000
Copper cathodes
Long Term Contracts
Long term contracts \| T	48,000
Molybdenum concentrates
Long Term Contracts
Long term contracts \| T	21,824
Sulfuric acid
Long Term Contracts
Long term contracts \| T	373,296
Mexican Open-Pit \| Operating segment
Opening and closing balances of receivables
Trade receivables	$ 889.3	623.0
Related parties receivable current:	29.1	39.7
Mexican IMMSA Unit \| Operating segment
Opening and closing balances of receivables
Trade receivables	65.8	59.7
Related parties receivable current:	16.8	25.1
Peruvian Operations \| Operating segment
Opening and closing balances of receivables
Trade receivables	602.6	506.9
Related parties receivable current:	$ 0.6	$ 1.3

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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