REVENUE: - Receivables by reporting segment (Details) $ in Millions	6 Months Ended
Jun. 30, 2020 USD ($) T	Dec. 31, 2019 USD ($)
Opening and closing balances of receivables
Trade receivables	$ 854.0	$ 832.9
Related parties, current	42.1	30.0
Related parties, non-current	58.5	59.5
Corporate, other and eliminations
Opening and closing balances of receivables
Related parties, current	$ 8.6	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	293,150
Mexican Open-pit \| Operating segment
Opening and closing balances of receivables
Trade receivables	$ 470.7	477.8
Related parties, current	33.5	22.1
Related parties, non-current	58.5	59.5
Mexican IMMSA Unit \| Operating segment
Opening and closing balances of receivables
Trade receivables	48.1	38.0
Peruvian Operations \| Operating segment
Opening and closing balances of receivables
Trade receivables	$ 335.2	$ 317.1

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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.

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