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COMMITMENTS AND CONTINGENCIES: - Environmental matters (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2011
category
person
Environmental costs          
Environmental capital investment   $ 102.8 $ 222.6 $ 250.4  
Peru          
Environmental costs          
Environmental capital investment   59.3 93.7 110.3  
Number of months for identification of contaminated sites and around in facilities 12 months        
Period for preparation of decontamination plan P30M        
Period of extension for preparation of decontamination plan 1 year        
Number of days in which results of soil confirmation tests are to be presented to authorities 30 days        
Mexico          
Environmental costs          
Environmental capital investment   $ 43.5 $ 128.9 $ 140.1  
Number of categories of collective actions | category         3
Minimum number of people claiming injury due to collective action initiative in Civil Federal Procedures Code (CFPC) | person         30