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ASSET RETIREMENT OBLIGATION: (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
item
Sep. 30, 2018
USD ($)
Asset retirement obligation activity        
Balance at the beginning of the year     $ 217.7 $ 222.5
Changes in estimates     25.2 (15.6)
Closure Payments     (0.8)  
Accretion expense     9.5 8.9
Balance at the end of the year     $ 251.6 $ 215.8
Peru        
ASSET RETIREMENT OBLIGATION:        
Period after which successive reviews are required by the law (in years)     5 years  
Accepted value of the Lima office complex and warehouse     $ 45.3  
Cumulative guarantee amount     $ 37.8  
Number of units with future closure costs recognized as an asset retirement obligation | item     3  
Asset retirement obligation activity        
Changes in estimates $ 28.1      
Mexico        
Asset retirement obligation activity        
Changes in estimates   $ (10.4)