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ASSET RETIREMENT OBLIGATION: (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 24, 2019
Mar. 31, 2024
USD ($)
item
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2023
USD ($)
ASSET RETIREMENT OBLIGATION:            
Maximum annual guarantees secured 50.00%          
Percentage of guarantee for Lima complex   50.00%        
Percentage of security for LOC   50.00%        
Total guarantees           $ 77.1
Asset retirement obligation, increase (decrease) in asset due to revision in estimate       $ (43.3)    
Asset retirement obligation activity            
Balance at the beginning of the year   $ 612.5 $ 585.3      
Decrease in estimates   (2.3)        
Closure payments     (0.2)      
Accretion expense   7.6 6.4      
Balance at the end of the year   $ 617.8 $ 591.5 585.3    
Cost of goods sold            
ASSET RETIREMENT OBLIGATION:            
Asset retirement obligations, increase (decrease) in estimate       (16.2)    
Peru            
ASSET RETIREMENT OBLIGATION:            
Period after which successive reviews are required by the law (in years)   5 years        
Number of units with future closure costs recognized as an asset retirement obligation | item   3        
Change in asset retirement liability       $ (59.5)    
Asset retirement obligation activity            
Decrease in estimates         $ 28.1  
Mexico            
Asset retirement obligation activity            
Decrease in estimates   $ (2.3)