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REVENUE: - Receivables by reporting segment (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
T
Dec. 31, 2018
USD ($)
Opening and closing balances of receivables    
Trade receivables $ 787.1 $ 822.4
Related parties 91.0 101.5
Corporate, other and eliminations    
Opening and closing balances of receivables    
Related parties $ 8.8 19.9
Copper concentrates    
Long Term Contracts    
Long term contracts | T 1,090,000  
Copper cathodes    
Long Term Contracts    
Long term contracts | T 48,000  
Molybdenum concentrates    
Long Term Contracts    
Long term contracts | T 24,106  
Sulfuric acid    
Long Term Contracts    
Long term contracts | T 331,620  
Mexican Open-pit | Operating segment    
Opening and closing balances of receivables    
Trade receivables $ 378.6 505.9
Related parties 82.2 81.6
Mexican IMMSA Unit | Operating segment    
Opening and closing balances of receivables    
Trade receivables 39.8 50.5
Peruvian Operations | Operating segment    
Opening and closing balances of receivables    
Trade receivables $ 368.7 $ 266.0