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RELATED PARTY TRANSACTIONS: (Details)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2012
item
MW
Dec. 31, 2014
item
RELATED PARTY TRANSACTIONS:            
Related parties receivable current:   $ 30.0 $ 101.5 $ 26.1    
Related parties receivable non-current:   59.5        
Related parties payable:   86.4 75.3      
Total purchases   2.9 12.9 1.7    
Total sales   2.2 1.5 0.7    
Grupo Mexico and affiliates            
RELATED PARTY TRANSACTIONS:            
Total purchases   385.6 380.5 474.6    
Total sales   58.9 150.3 197.6    
Asarco LLC            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current:   10.8 74.4      
Related parties receivable non-current:   59.5        
Related parties payable:   4.3 4.1      
Total purchases   37.6 37.2 37.2    
Total sales   11.3 81.8 96.2    
Accounts Receivable $ 62.0          
Making quarterly payments $ 0.5          
Asarco LLC | Other Noncurrent Assets [Member]            
RELATED PARTY TRANSACTIONS:            
Due from related parties   2.3        
Due from related parties, non-current   59.5        
Asarco LLC | London Interbank Offered Rate (LIBOR) [Member]            
RELATED PARTY TRANSACTIONS:            
Debt Instrument, Basis Spread on Variable Rate 2.00%          
Debt Instrument, Interest Rate, Effective Percentage 4.08513%          
AMMINCO            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current:   0.1 0.2      
Related parties payable:   16.9 8.0      
Total purchases   17.8 8.0      
Total sales   0.1 0.3      
AMC            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current:     11.0      
Compania Perforadora Mexico, S.A.P.I. de C.V. and affiliates            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current:   0.3 1.4      
Total sales   0.1   0.2    
Eolica El Retiro, S.A.P.I. de C.V.            
RELATED PARTY TRANSACTIONS:            
Related parties payable:     1.0      
Total purchases   $ 2.9 $ 3.6 3.3    
Number of wind turbines | item           37
Percentage of supply to third-party energy users   18.20% 18.00%      
Ferrocarril Mexicano, S.A. de C.V.            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current:     $ 0.1      
Related parties payable:   $ 6.4 6.4      
Total purchases   44.1 41.7 43.5    
Grupo Mexico            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current:   2.7 2.7      
Related parties payable:   1.1 0.6      
Total purchases   10.0 10.1 14.0    
Total sales       0.2    
Donations   9.6 6.2      
Mexico Generadora de Energia, S. de R.L. ("MGE")            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current:   15.3 10.3      
Related parties payable:   40.2 40.6      
Total purchases   202.2 200.1 223.7    
Total sales   $ 47.4 $ 68.2 101.0    
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   5.20% 17.10%      
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates ("MPD")            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current:   $ 0.2 $ 0.6      
Related parties payable:   16.0 14.4      
Total purchases   $ 71.0 79.8 152.9    
Apu Coropuna S.R.L.            
RELATED PARTY TRANSACTIONS:            
Ownership percentage   30.00%        
Related to the controlling group            
RELATED PARTY TRANSACTIONS:            
Total purchases   $ 0.2 0.2 0.1    
Boutique Bowling de Mexico, S.A. de C.V.            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current:   0.1 0.3      
Related parties payable:   0.2 0.1      
Total purchases   0.4 0.3 0.3    
Total sales   0.1 0.2 0.2    
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:   0.4 0.1      
Related parties payable:   1.2        
Total sales   1.8 1.2 0.3    
Operadora de Cinemas S.A. de C.V.            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current:   0.1 0.4      
Related parties payable:   0.1 0.1      
Total purchases   2.3 12.4 1.3    
Total sales   $ 0.1 $ 0.1 0.2    
Related to SCC executive officers            
RELATED PARTY TRANSACTIONS:            
Total purchases       $ 0.2    
Equity investment in affiliate            
RELATED PARTY TRANSACTIONS:            
Ownership percentage   44.20%