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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 02, 2016 lawsuit
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Commitments and contingencies |  |  |
Future purchase commitments | $ 992.6 | $ 1,104.3 |
Commitments for capital expenditures | $ 153.1 | $ 186.6 |
Compania Minera Maricunga | Other regulatory matters |  |  |
Commitments and contingencies |  |  |
Number of lawsuits | lawsuit |  |  | 2

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- Definition The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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