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SEGMENT AND RELATED INFORMATION: - Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financial information related to segments
Trade receivables	$ 832.9	$ 822.4	$ 890.6
Related parties receivable current:	30.0	101.5	26.1
Related parties receivable non-current:	59.5
Corporate, other and eliminations
Financial information related to segments
Related parties receivable current:	7.9	19.9	8.1
Mexican Open-pit
Financial information related to segments
Trade receivables	477.8	505.9	556.2
Related parties receivable current:	22.1	81.6	18.0
Related parties receivable non-current:	59.5
Mexican IMMSA Unit
Financial information related to segments
Trade receivables	38.0	50.5	79.7
Peruvian Operations
Financial information related to segments
Trade receivables	$ 317.1	$ 266.0	$ 254.7

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- Definition

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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The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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