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SEGMENT AND RELATED INFORMATION: - Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Financial information related to segments    
Trade receivables $ 1,358.7 $ 1,068.9
Related parties receivable current: 49.1 23.3
Corporate, other and eliminations    
Financial information related to segments    
Related parties receivable current: 2.0 7.1
Mexican Open-Pit    
Financial information related to segments    
Trade receivables 656.0 566.0
Related parties receivable current: 46.9 15.4
Mexican IMMSA Unit    
Financial information related to segments    
Trade receivables 51.2 57.8
Related parties receivable current: 0.2  
Peruvian Operations    
Financial information related to segments    
Trade receivables $ 651.5 445.1
Related parties receivable current:   $ 0.8