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REVENUE: - Receivables by reporting segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) T	Dec. 31, 2023 USD ($)
Opening and closing balances of receivables
Trade receivables	$ 1,293.9	$ 1,141.1
Related parties, current	$ 23.2	27.3
Corporate, other and eliminations
Opening and closing balances of receivables
Related parties, current		(0.1)
Copper concentrates
Long Term Contracts
Long term contracts | T	180,000
Copper cathodes
Long Term Contracts
Long term contracts | T	48,000
Molybdenum concentrates
Long Term Contracts
Long term contracts | T	18,970
Sulfuric acid
Long Term Contracts
Long term contracts | T	346,276
Mexican Open-Pit | Operating segment
Opening and closing balances of receivables
Trade receivables	$ 708.1	556.3
Related parties, current	20.8	25.7
Mexican IMMSA Unit | Operating segment
Opening and closing balances of receivables
Trade receivables	47.7	49.1
Related parties, current	2.2	0.9
Peruvian Operations | Operating segment
Opening and closing balances of receivables
Trade receivables	538.1	535.7
Related parties, current	$ 0.2	$ 0.8

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- References

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- Definition

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/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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-9

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- Definition

Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

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