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REVENUE: - Receivables by reporting segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) T	Dec. 31, 2021 USD ($)
Opening and closing balances of receivables
Trade receivables	$ 1,185.8	$ 1,358.7
Related parties, current	29.9	49.1
Corporate, other and eliminations
Opening and closing balances of receivables
Trade receivables	(113.6)
Related parties, current	$ 2.2	2.0
Copper concentrates
Long Term Contracts
Long term contracts | T	118,000
Copper cathodes
Long Term Contracts
Long term contracts | T	48,000
Molybdenum concentrates
Long Term Contracts
Long term contracts | T	37,000
Sulfuric acid
Long Term Contracts
Long term contracts | T	354,851
Mexican Open-Pit | Operating segment
Opening and closing balances of receivables
Trade receivables	$ 728.6	656.0
Related parties, current	27.4	46.9
Mexican IMMSA Unit | Operating segment
Opening and closing balances of receivables
Trade receivables	60.5	51.2
Related parties, current	0.2	0.2
Peruvian Operations | Operating segment
Opening and closing balances of receivables
Trade receivables	510.3	$ 651.5
Related parties, current	$ 0.1

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