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WORKERS' PARTICIPATION: (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Statutory workers' participation      
Current $ 140.8 $ 221.2 $ 201.6
Deferred (19.8) (11.4) 31.4
Workers' participation expense (in USD) $ 121.0 209.8 $ 233.0
Peru      
Statutory workers' participation      
Provision for workers' participation as a percentage of pre-tax earnings 8.00%    
Number of months for which an individual worker's salary is capped for consideration of annual individual worker participation 18 months    
Maximum taxable units contributed by employer to benefit fund (in Peruvian taxable units) | item 2,200    
Maximum employer contribution to benefit fund (in USD) $ 2.5    
Mexico      
Statutory workers' participation      
Provision for workers' participation as a percentage of pre-tax earnings 10.00%    
Deferred workers participation provision   $ 16.3