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ASSET RETIREMENT OBLIGATION: (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 24, 2019
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
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            
Dismantling cost related to the Quebalix IV closure plan     $ 11.9      
Balance at the beginning of the year   $ 562.9 562.9 $ 545.0    
Changes in estimates     (10.8)      
Additions     11.9      
Closure payments     (7.1) (5.6)    
Accretion expense     28.4 23.5    
Balance at the end of the year     585.3 $ 562.9    
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            
Changes in estimates         $ 28.1  
Mexico            
Asset retirement obligation activity            
Changes in estimates   $ 43.3