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RELATED PARTY TRANSACTIONS: (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2012
item
MW
Dec. 31, 2023
USD ($)
Dec. 31, 2014
item
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: $ 23.2     $ 27.3  
Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: 23.2     27.3  
Other accrued liabilities 84.4     93.6  
Total purchases 103.2 $ 127.9      
Total sales $ 0.8 0.5      
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 22.3 27.9      
Asarco LLC ("Asarco") | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: 5.1     9.4  
Other accrued liabilities 15.0     13.8  
Total purchases 1.2 26.5      
Total sales 6.7 9.1      
AMMINCO Apoyo Administrativo, S.A. de C.V. ("AMMINCO") | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities 5.8     5.0  
Total purchases 2.5 2.5      
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 0.1     0.2  
Total purchases $ 0.1 $ 0.4      
Percentage of supply to third-party energy users 3.40% 11.60%      
Ferrocarril Mexicano, S.A. de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities $ 6.7     7.9  
Total purchases 8.1 $ 14.4      
Grupo Mexico | Affiliates          
RELATED PARTY TRANSACTIONS:          
Total purchases 1.0 1.0      
Grupo Mexico Servicios | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities 5.2     2.7  
Total purchases 5.0 5.0      
Donations 0.6 1.4      
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     17.1  
Other accrued liabilities 40.0     50.3  
Total purchases 61.7 62.0      
Total sales $ 15.6 $ 18.8      
MGE | Affiliates | Mexico          
RELATED PARTY TRANSACTIONS:          
Net total capacity (in megawatts) | MW     516.2    
Percentage of supply to third-party energy users 5.20% 0.60%      
Mexico Compania Constructora S.A de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities $ 9.5     9.5  
Total purchases 20.6 $ 13.9      
Grupo Mexico Servicios de Ingenieria, S.A. de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities 1.4     3.5  
Total purchases 4.0 3.2      
Boutique Bowling de Mexico, S.A. de C.V. | Affiliates          
RELATED PARTY TRANSACTIONS:          
Other accrued liabilities 0.4     0.3  
Total purchases 0.2 0.1      
Empresarios Industriales de Mexico, S.A. de C.V | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: 0.7     0.6  
Total sales 0.1        
Mexico Transportes Aereos S.A. de C.V. ("Mextransport") | Affiliates          
RELATED PARTY TRANSACTIONS:          
Related parties receivable current: 0.2     0.1  
Other accrued liabilities 0.1     0.3  
Total purchases 0.7 0.8      
Total sales 0.6 0.5      
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     0.1  
Total purchases $ 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