REVENUE: - Receivables by reporting segment (Details) $ in Millions	6 Months Ended
Jun. 30, 2026 USD ($) T	Dec. 31, 2025 USD ($)
Opening and closing balances of receivables
Trade receivables	$ 1,995.7	$ 1,951.2
Related parties receivable current:	10.9	16.2
Operating segment
Opening and closing balances of receivables
Trade receivables	1,995.7	1,951.2
Related parties receivable current:	48.1	100.6
Corporate & Elimination
Opening and closing balances of receivables
Related parties receivable current:	$ (37.2)	(84.3)
Copper contained in concentrates
Long Term Contracts
Long term contracts \| T	167,100
Copper cathodes
Long Term Contracts
Long term contracts \| T	70,200
Molybdenum concentrates
Long Term Contracts
Long term contracts \| T	20,878
Sulfuric acid
Long Term Contracts
Long term contracts \| T	362,103
Mexican Open-Pit \| Operating segment
Opening and closing balances of receivables
Trade receivables	$ 1,194.6	1,149.9
Related parties receivable current:	23.6	47.9
Mexican IMMSA Unit \| Operating segment
Opening and closing balances of receivables
Trade receivables	97.8	91.9
Related parties receivable current:	23.1	52.6
Peruvian Operations \| Operating segment
Opening and closing balances of receivables
Trade receivables	703.4	709.5
Related parties receivable current:	$ 1.5	$ 0.1

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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