XML 81 R60.htm IDEA: XBRL DOCUMENT v3.10.0.1
ASSET RETIREMENT OBLIGATION: (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Asset retirement obligation activity          
Balance at the beginning of the year     $ 222.5 $ 222.5 $ 216.5
Changes in estimates       (15.6) (11.6)
Closure Payments       (0.6) (0.3)
Accretion expense       11.4 17.9
Balance at the end of the year $ 222.5     217.7 $ 222.5
Mexico          
ASSET RETIREMENT OBLIGATION:          
Plant demolition and soil remediation cost       $ 66.2  
Asset retirement obligation activity          
Changes in estimates   $ (10.4)      
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 $ (11.6)   $ (5.2)