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RELATED PARTY TRANSACTIONS: (Details)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2012
item
MW
Dec. 31, 2022
USD ($)
Dec. 31, 2014
item
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: $ 24.6     $ 33.3  
Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: 24.6     33.3  
Other accrued liabilities 126.7     120.2  
Total purchases 322.5 $ 399.2      
Total sales $ 2.1 1.6      
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 80.8 165.8      
Asarco LLC ("Asarco") | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: 8.6     9.2  
Other accrued liabilities 24.5     23.8  
Total purchases 31.4 51.9      
Total sales 29.9 32.2      
AMMINCO Apoyo Administrativo, S.A. de C.V. ("AMMINCO") | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities 9.3     5.0  
Total purchases 7.5 6.7      
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. and affiliates | 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 0.4     0.4  
Total purchases $ 2.1 $ 2.5      
Percentage of supply to third-party energy users 14.90% 32.50%      
Ferrocarril Mexicano, S.A. de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities $ 9.9     5.6  
Total purchases 40.1 $ 32.5      
Grupo Mexico | Affiliates          
RELATED PARTY TRANSACTIONS:          
Total purchases 3.0 1.9      
Grupo Mexico Servicios | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities 19.1     20.2  
Total purchases 15.1 15.1      
Donations 3.4 2.6      
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: 15.3     23.4  
Other accrued liabilities 42.9     57.5  
Total purchases 176.9 250.8      
Total sales $ 50.9 $ 133.6      
MGE | Affiliates | Mexico          
RELATED PARTY TRANSACTIONS:          
Net total capacity (in megawatts) | MW     516.2    
Percentage of supply to third-party energy users 8.20% 1.80%      
Mexico Compania Constructora S.A de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities $ 18.5     5.9  
Mexico Proyectos y Desarrollos SA de CV and affiliates | Affiliates          
RELATED PARTY TRANSACTIONS:          
Total purchases 49.4 $ 38.9      
Grupo Mexico Servicios de Ingenieria, S.A. de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: 0.1     0.2  
Other accrued liabilities 1.2     1.2  
Boutique Bowling de Mexico, S.A. de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current:       0.1  
Other accrued liabilities 0.4     0.3  
Total purchases 0.5 0.2      
Total sales 0.1 0.1      
Empresarios Industriales de Mexico, S.A. de C.V | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: 0.3        
Total sales 0.2        
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 2.2 1.6      
Total sales 1.7 1.4      
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     0.2  
Total purchases 0.3 0.1      
Total sales $ 0.1 0.1      
Amminco Apoyo, Ferrocarril Mexicano and Operadora De Cinemas | Affiliates | Maximum          
RELATED PARTY TRANSACTIONS:          
Related party receivable and payable       $ 0.1  
Amminco Apoyo and Ferrocarril Mexicano | Affiliates | Maximum          
RELATED PARTY TRANSACTIONS:          
Threshold revenue from related parties   0.1      
Boutique Bowling and Operadora De Cinemas | Affiliates | Maximum          
RELATED PARTY TRANSACTIONS:          
Total sales   $ 0.1