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REVENUE RECOGNITION: - Receivables by reporting segment (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Opening and closing balances of receivables    
Trade receivables $ 778.4 $ 890.6
Related parties 90.7 26.1
Corporate, other and eliminations    
Opening and closing balances of receivables    
Related parties 8.9 8.1
Mexican Open-pit | Operating segment    
Opening and closing balances of receivables    
Trade receivables 459.7 556.2
Related parties 81.8 18.0
Mexican IMMSA Unit | Operating segment    
Opening and closing balances of receivables    
Trade receivables 47.3 79.7
Peruvian Operations | Operating segment    
Opening and closing balances of receivables    
Trade receivables $ 271.4 $ 254.7