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RELATED PARTY TRANSACTIONS: (Details)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2020
MWh
Dec. 31, 2012
item
MW
Dec. 31, 2024
USD ($)
Dec. 31, 2014
item
RELATED PARTY TRANSACTIONS:            
Related parties receivable current: $ 14.5       $ 13.5  
Affiliates            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current: 14.5       13.5  
Other accrued liabilities 131.6       49.2  
Total purchases 350.1 $ 267.2        
Total sales $ 2.2 2.3        
Affiliates | Compaia Minera Coimolache S.A. ("Coimolache")            
RELATED PARTY TRANSACTIONS:            
Ownership percentage (Equity method investment) 44.20%          
Affiliates | Apu Coropuna S.R.L.            
RELATED PARTY TRANSACTIONS:            
Ownership percentage (Equity method investment) 30.00%          
Affiliates | Minimum            
RELATED PARTY TRANSACTIONS:            
Aggregate consideration of Material Affiliate Transaction to be be authorized by the General Counsel and CFO $ 8.0          
Affiliates | 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 | Affiliates            
RELATED PARTY TRANSACTIONS:            
Total sales 83.1 51.1        
Asarco LLC ("Asarco") | Affiliates            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current: 6.4       7.1  
Other accrued liabilities 50.7       6.0  
Total purchases 49.9 3.7        
Total sales 40.4 27.0        
AMMINCO Apoyo Administrativo, S.A. de C.V. ("AMMINCO") | Affiliates            
RELATED PARTY TRANSACTIONS:            
Other accrued liabilities 10.3       6.0  
Total purchases 7.5 7.5        
Total sales 0.1 0.1        
AMMINCO Apoyo Administrativo, S.A. de C.V. ("AMMINCO") | Affiliates | Maximum            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current: 0.1       0.1  
Eolica El Retiro, S.A.P.I. de C.V.            
RELATED PARTY TRANSACTIONS:            
Number of wind turbines | item           37
Eolica El Retiro, S.A.P.I. de C.V. | Affiliates            
RELATED PARTY TRANSACTIONS:            
Other accrued liabilities 1.9       0.4  
Total purchases $ 2.6 $ 4.4        
Percentage of supply to third-party energy users 20.90% 30.90%        
Ferrocarril Mexicano, S.A. de C.V. | Affiliates            
RELATED PARTY TRANSACTIONS:            
Other accrued liabilities $ 6.2       2.9  
Total purchases 35.6 $ 37.2        
Ferrocarril Mexicano, S.A. de C.V. | Affiliates | Maximum            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current: 0.1       0.1  
Threshold revenue from related parties 0.1 0.1        
Grupo Mexico and affiliates | Affiliates            
RELATED PARTY TRANSACTIONS:            
Total purchases 2.4 2.7        
Donations 0.0 1.9        
Grupo Mexico Servicios | Affiliates            
RELATED PARTY TRANSACTIONS:            
Other accrued liabilities 5.6       4.3  
Total purchases 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    
Mexico Generadora de Energia S. de R.L. ("MGE") | Affiliates            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current: 6.3       5.4  
Other accrued liabilities 37.4       15.9  
Total purchases 161.9 123.4        
Total sales $ 42.6 $ 24.0        
Mexico Generadora de Energia S. de R.L. ("MGE") | Affiliates | Mexico            
RELATED PARTY TRANSACTIONS:            
Net total capacity (in megawatts) | MW       516.2    
Percentage of supply to third-party energy users 11.80% 8.00%        
Mexico Compania Constructora S.A de C.V. | Affiliates            
RELATED PARTY TRANSACTIONS:            
Other accrued liabilities $ 9.1       8.0  
Total purchases 36.2 $ 58.0        
Mexico Compania Constructora S.A de C.V. | Affiliates | Maximum            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current: 0.1       0.1  
Parque Eolico de Fenicias, S. de R.L. de C.V. | Affiliates            
RELATED PARTY TRANSACTIONS:            
Other accrued liabilities 7.0       2.6  
Total purchases $ 30.3 4.6        
Purchase agreement, contracted power capacity (in megawatts per year) | MWh     611,400      
Term of power purchase agreement related to sale of power plant     20 years      
Percentage of supply to third-party energy users 90.20%          
Grupo Mexico Servicios de Ingenieria, S.A. de C.V. | Affiliates            
RELATED PARTY TRANSACTIONS:            
Other accrued liabilities $ 2.5       2.1  
Total purchases 11.0 13.3        
Boutique Bowling de Mexico, S.A. de C.V. | Affiliates            
RELATED PARTY TRANSACTIONS:            
Other accrued liabilities 0.4       0.5  
Total purchases 0.5 0.4        
Total sales 0.1 0.1        
Empresarios Industriales de Mexico, S.A. de C.V | Affiliates            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current: 1.4       0.9  
Total sales 0.3 0.3        
Mexico Transportes Aereos S.A. de C.V. ("Mextransport") | Affiliates            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current: 0.2          
Other accrued liabilities 0.3       0.1  
Total purchases 1.8 2.1        
Total sales 1.7 1.8        
Operadora de Cinemas S.A. de C.V. | Affiliates            
RELATED PARTY TRANSACTIONS:            
Related parties receivable current: 0.1       0.1  
Other accrued liabilities 0.2       $ 0.4  
Total purchases 0.1 0.2        
Total sales $ 0.1 $ 0.1