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ASSET RETIREMENT OBLIGATION: (Details)
$ in Millions
6 Months Ended
Jun. 24, 2019
Jun. 30, 2024
USD ($)
item
Jun. 30, 2023
USD ($)
Jan. 31, 2024
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       $ 87.7
Asset retirement obligation activity        
Balance at the beginning of the year   $ 612.6 $ 585.3  
Decrease in estimates   (7.7)    
Closure payments     (0.3)  
Accretion expense   14.3 12.9  
Balance at the end of the year   $ 619.2 $ 597.9  
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   $ (3.2)    
Mexico        
Asset retirement obligation activity        
Decrease in estimates   $ 4.5