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REVENUE: - Receivables by reporting segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) T	Dec. 31, 2019 USD ($)
Opening and closing balances of receivables
Trade receivables	$ 709.7	$ 832.9
Related parties, current	35.3	30.0
Related parties, non-current	59.0	59.5
Corporate, other and eliminations
Opening and closing balances of receivables
Related parties, current	$ 7.9	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	292,400
Mexican Open-pit | Operating segment
Opening and closing balances of receivables
Trade receivables	$ 411.1	477.8
Related parties, current	27.4	22.1
Related parties, non-current	59.0	59.5
Mexican IMMSA Unit | Operating segment
Opening and closing balances of receivables
Trade receivables	44.4	38.0
Peruvian Operations | Operating segment
Opening and closing balances of receivables
Trade receivables	$ 254.2	$ 317.1

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