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RELATED PARTY TRANSACTIONS: (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
item
Dec. 31, 2012
item
MW
Dec. 31, 2014
item
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: $ 27.3 $ 33.3      
Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: 27.3 33.3      
Other accrued liabilities 93.6 120.2      
Total purchases 418.2 534.6 $ 454.4    
Total sales $ 3.0 2.1 2.0    
Affiliates | Equity investment in affiliate          
RELATED PARTY TRANSACTIONS:          
Ownership percentage 44.20%        
Affiliates | Apu Coropuna S.R.L.          
RELATED PARTY TRANSACTIONS:          
Ownership percentage 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 105.9 213.0 160.5    
Asarco LLC ("Asarco") | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: 9.4 9.2      
Other accrued liabilities 13.8 23.8      
Total purchases 30.4 66.3 31.3    
Total sales 39.6 48.0 33.4    
Americas Mining Corporation | Affiliates          
RELATED PARTY TRANSACTIONS:          
Total sales     0.1    
AMMINCO Apoyo Administrativo, S.A. de C.V. ("AMMINCO") | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities 5.0 5.0      
Total purchases 10.0 10.0 8.9    
Total sales     0.1    
AMMINCO Apoyo Administrativo, S.A. de C.V. ("AMMINCO") | Affiliates | Maximum          
RELATED PARTY TRANSACTIONS:          
Related party receivable and payable 0.1 0.1      
Threshold revenue from related parties 0.1 0.1      
Controladora de Infraestructura Energetica Mexico, S. A. de C. V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Total purchases   0.8      
Compania Perforadora Mexico S.A.P.I. de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current:   0.3      
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 0.2 0.4      
Total purchases $ 2.3 $ 3.0 9.3    
Percentage of supply to third-party energy users 12.00% 27.00%      
Ferrocarril Mexicano, S.A. de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities $ 7.9 $ 5.6      
Total purchases 53.0 42.9 41.8    
Grupo Mexico | Affiliates          
RELATED PARTY TRANSACTIONS:          
Total purchases 3.9 2.7 2.5    
Donations 4.3 3.5 0.9    
Grupo Mexico Servicios | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities 2.7 20.2      
Total purchases 20.1 20.1 20.1    
Intermodal Mexico S.A. de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Total purchases     0.5    
MGE | Mexico          
RELATED PARTY TRANSACTIONS:          
Number of natural gas-fired combined cycle power generating units | item       2  
MGE | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: 17.1 23.4      
Other accrued liabilities 50.3 57.5      
Total purchases 224.6 331.0 287.3    
Total sales $ 66.3 $ 165.0 126.9    
MGE | Affiliates | Mexico          
RELATED PARTY TRANSACTIONS:          
Net total capacity (in megawatts) | MW       516.2  
Percentage of supply to third-party energy users 7.60% 1.40%      
Mexico Compania Constructora S.A de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities $ 9.5 $ 5.9      
Total purchases 59.8 43.8 44.5    
Grupo Mexico Servicios de Ingenieria, S.A. de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current:   0.2      
Other accrued liabilities 3.5 1.2      
Total purchases 18.0 16.7 $ 10.3    
Peru Mining Exploration And Development Company          
RELATED PARTY TRANSACTIONS:          
Number of mining concessions purchased | item     3    
Peru Mining Exploration And Development Company | Affiliates          
RELATED PARTY TRANSACTIONS:          
Total purchases     $ 0.4    
Boutique Bowling de Mexico, S.A. de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current:   0.1      
Other accrued liabilities 0.3 0.3      
Total purchases 0.7 0.4 0.3    
Total sales 0.1 0.1 0.1    
Empresarios Industriales de Mexico, S.A. de C.V | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: 0.6        
Total sales 0.5        
Mexico Transportes Aereos S.A. de C.V. ("Mextransport") | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: 0.1        
Other accrued liabilities 0.3 0.1      
Total purchases 2.8 2.1 1.8    
Total sales 2.3 1.9 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 0.1 0.2      
Total purchases 0.4 0.2 0.4    
Total sales $ 0.1 $ 0.1 $ 0.1