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REVENUE: - Receivables by reporting segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) T	Dec. 31, 2022 USD ($)
Opening and closing balances of receivables
Trade receivables	$ 1,262.6	$ 1,394.1
Related parties, current	13.7	33.3
Corporate, other and eliminations
Opening and closing balances of receivables
Related parties, current	$ (2.0)	2.0
Copper concentrates
Long Term Contracts
Long term contracts | T	100,000
Copper cathodes
Long Term Contracts
Long term contracts | T	32,000
Molybdenum concentrates
Long Term Contracts
Long term contracts | T	34,050
Sulfuric acid
Long Term Contracts
Long term contracts | T	382,000
Mexican Open-Pit | Operating segment
Opening and closing balances of receivables
Trade receivables	$ 737.1	788.1
Related parties, current	13.4	31.1
Mexican IMMSA Unit | Operating segment
Opening and closing balances of receivables
Trade receivables	59.4	60.0
Related parties, current	1.4	0.1
Peruvian Operations | Operating segment
Opening and closing balances of receivables
Trade receivables	466.1	546.0
Related parties, current	$ 0.9	$ 0.1

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