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RELATED PARTY TRANSACTIONS: (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2012
item
MW
Dec. 31, 2019
USD ($)
Aug. 04, 2014
item
RELATED PARTY TRANSACTIONS:              
Related parties receivable current:   $ 42.4 $ 42.4     $ 30.0  
Related parties receivable non-current:   58.0 58.0     59.5  
Related parties payable:   99.6 99.6     86.4  
Total purchases     3.4 $ 1.5      
Total sales     1.4 1.7      
Minimum              
RELATED PARTY TRANSACTIONS:              
Aggregate consideration of Material Affiliate Transaction to be be authorized by the General Counsel and CFO     8.0        
Maximum              
RELATED PARTY TRANSACTIONS:              
Aggregate consideration of Material Affiliate Transaction to be be authorized by the General Counsel and CFO     10.0        
Grupo Mexico and affiliates              
RELATED PARTY TRANSACTIONS:              
Total purchases     482.4 288.2      
Total sales     96.4 44.0      
Asarco LLC              
RELATED PARTY TRANSACTIONS:              
Related parties receivable current:   22.4 22.4     10.8  
Related parties receivable non-current:   58.0 58.0     59.5  
Related parties payable:   18.3 18.3     4.3  
Total purchases     224.3 32.2      
Total sales     58.6 10.6      
Accounts Receivable   62.0 62.0        
Making quarterly payments     0.5        
Interest earned     1.8        
Asarco LLC | Other Noncurrent Assets [Member]              
RELATED PARTY TRANSACTIONS:              
Related parties receivable non-current:   58.0 $ 58.0        
Asarco LLC | London Interbank Offered Rate (LIBOR) [Member]              
RELATED PARTY TRANSACTIONS:              
Debt Instrument, Basis Spread on Variable Rate     2.00%        
AMMINCO              
RELATED PARTY TRANSACTIONS:              
Related parties receivable current:           0.1  
Related parties payable:   17.5 $ 17.5     16.9  
Total purchases     13.4 6.4      
Total sales     0.1        
Compania Perforadora Mexico, S.A.P.I. de C.V. and affiliates              
RELATED PARTY TRANSACTIONS:              
Related parties receivable current:   0.3 0.3     0.3  
Eolica El Retiro, S.A.P.I. de C.V.              
RELATED PARTY TRANSACTIONS:              
Related parties payable:   0.3 0.3        
Total purchases     $ 0.8 $ 2.9      
Number of wind turbines | item             37
Percentage of supply to third-party energy users     11.50% 25.40%      
Ferrocarril Mexicano, S.A. de C.V.              
RELATED PARTY TRANSACTIONS:              
Related parties payable:   5.3 $ 5.3     6.4  
Total purchases     36.8 $ 35.1      
Total sales       0.1      
Grupo Mexico              
RELATED PARTY TRANSACTIONS:              
Related parties receivable current:   2.7 2.7     2.7  
Related parties payable:   0.9 0.9     1.1  
Total purchases     7.5 7.9      
Donations   7.0   8.9      
Mexico Generadora de Energia, S. de R.L. ("MGE")              
RELATED PARTY TRANSACTIONS:              
Related parties receivable current:   15.1 15.1     15.3  
Related parties payable:   36.4 36.4     40.2  
Total purchases     157.2 147.3      
Total sales     37.7 $ 33.3      
Accounts Receivable $ 97.2            
Making quarterly payments $ 4.2            
Debt Instrument, Basis Spread on Variable Rate 8.28%            
Due from related parties, non-current   15.1 15.1        
Mexico Generadora de Energia, S. de R.L. ("MGE") | Mexico              
RELATED PARTY TRANSACTIONS:              
Number of natural gas-fired combined cycle power generating units | item         2    
Net total capacity (in megawatts) | MW         516.2    
Percentage of supply to third-party energy users       6.20% 2.60%    
Mexico Compania Constructora S.A de C.V.              
RELATED PARTY TRANSACTIONS:              
Related parties payable:   19.4 19.4     16.0  
Total purchases     36.0 $ 47.0      
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates ("MPD")              
RELATED PARTY TRANSACTIONS:              
Related parties receivable current:   0.2 0.2     0.2  
Related parties payable:   $ 0.5 0.5        
Mexico Proyectos y Desarrollos SA de CV and affiliates              
RELATED PARTY TRANSACTIONS:              
Total purchases     $ 6.4 9.4      
Apu Coropuna S.R.L.              
RELATED PARTY TRANSACTIONS:              
Ownership percentage   30.00% 30.00%        
Boutique Bowling de Mexico, S.A. de C.V.              
RELATED PARTY TRANSACTIONS:              
Related parties receivable current:   $ 0.1 $ 0.1     0.1  
Related parties payable:   0.1 0.1     0.2  
Total purchases     0.3 0.3      
Total sales     0.1 0.1      
Empresarios Industriales de Mexico, S.A. de C.V              
RELATED PARTY TRANSACTIONS:              
Total sales       0.2      
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport")              
RELATED PARTY TRANSACTIONS:              
Related parties receivable current:   1.5 1.5     0.4  
Related parties payable:   0.8 0.8     1.2  
Total purchases     3.0 1.1      
Total sales     1.2 1.3      
Operadora de Cinemas S.A. de C.V.              
RELATED PARTY TRANSACTIONS:              
Related parties receivable current:   0.1 0.1     0.1  
Related parties payable:   $ 0.1 0.1     $ 0.1  
Total purchases     0.1 0.1      
Total sales     $ 0.1 $ 0.1      
Equity investment in affiliate              
RELATED PARTY TRANSACTIONS:              
Ownership percentage   44.20% 44.20%