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REVENUE: - Receivables by reporting segment (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) T	Dec. 31, 2019 USD ($)
Opening and closing balances of receivables
Trade receivables	$ 955.5	$ 832.9
Related parties, current	42.4	30.0
Related parties, non-current	58.0	59.5
Corporate, other and eliminations
Opening and closing balances of receivables
Related parties, current	$ 8.5	7.9
Copper concentrates
Long Term Contracts
Long term contracts | T	870,000
Copper cathodes
Long Term Contracts
Long term contracts | T	48,000
Molybdenum concentrates
Long Term Contracts
Long term contracts | T	24,061
Sulfuric acid
Long Term Contracts
Long term contracts | T	293,840
Mexican Open-pit | Operating segment
Opening and closing balances of receivables
Trade receivables	$ 546.9	477.8
Related parties, current	33.9	22.1
Related parties, non-current	58.0	59.5
Mexican IMMSA Unit | Operating segment
Opening and closing balances of receivables
Trade receivables	58.2	38.0
Peruvian Operations | Operating segment
Opening and closing balances of receivables
Trade receivables	$ 350.4	$ 317.1

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