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ASSET RETIREMENT OBLIGATION: (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 24, 2019
Mar. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
item
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2023
USD ($)
ASSET RETIREMENT OBLIGATION:              
Asset retirement obligation, increase (decrease) in asset due to revision in estimate         $ (43.3)    
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 activity              
Balance at the beginning of the year   $ 562.9 $ 585.3 $ 562.9 562.9    
Changes in estimates       43.3   $ 28.1  
Closure payments     (0.3) (3.6)      
Accretion expense     12.9 13.0      
Balance at the end of the year     $ 597.9 $ 615.6 585.3    
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)    
Mexico              
Asset retirement obligation activity              
Changes in estimates   $ 43.3