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RELATED PARTY TRANSACTIONS: (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2022 USD ($)	Dec. 31, 2014 item
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	$ 13.7			$ 33.3
Related parties payable:	116.2			120.2
Total purchases	127.9	$ 105.2
Total sales	$ 0.5	0.5
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage	44.20%
Apu Coropuna S.R.L.
RELATED PARTY TRANSACTIONS:
Ownership percentage	30.00%
Minimum
RELATED PARTY TRANSACTIONS:
Aggregate consideration of Material Affiliate Transaction to be be authorized by the General Counsel and CFO	$ 8.0
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
RELATED PARTY TRANSACTIONS:
Total purchases	1.0	0.5
Total sales	27.9	45.9
Asarco LLC ("Asarco")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	3.4			9.2
Related parties payable:	37.4			23.8
Total purchases	26.5	14.6
Total sales	9.1	11.4
AMMINCO Apoyo Administrativo, S.A. de C.V. ("AMMINCO")
RELATED PARTY TRANSACTIONS:
Related parties payable:	7.5			5.0
Total purchases	2.5	2.2
Compania Perforadora Mexico S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.3
Eolica El Retiro, S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:	0.4			0.4
Total purchases	$ 0.4	$ 0.9
Number of wind turbines | item					37
Percentage of supply to third-party energy users	11.60%	46.60%
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:	$ 9.4			5.6
Total purchases	14.4	$ 5.2
Grupo Mexico Servicios
RELATED PARTY TRANSACTIONS:
Related parties payable:	14.0			20.2
Total purchases	5.0	5.0
Donations	1.4
MGE
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	9.7			23.4
Related parties payable:	42.4			57.5
Total purchases	62.0	70.1
Total sales	$ 18.8	$ 34.5
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	0.60%	0.20%
Mexico Compania Constructora S.A de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:	$ 3.6			5.9
Total purchases	13.9	$ 5.1
Grupo Mexico Servicios de Ingenieria, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	0.2			0.2
Related parties payable:	0.8			1.2
Total purchases	3.2	1.3
Controladora de Infraestructura Energetica Mexico, S. A. de C. V.
RELATED PARTY TRANSACTIONS:
Total purchases		0.8
Boutique Bowling de Mexico, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	0.1			0.1
Related parties payable:	0.1			0.3
Total purchases	0.1	0.1
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	0.2
Related parties payable:	0.5			0.1
Total purchases	0.8	0.4
Total sales	0.5	0.5
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	0.1			0.1
Related parties payable:	0.1			0.2
Total purchases	0.1
Amminco Apoyo, Ferrocarril Mexicano and Operadora De Cinemas | Maximum
RELATED PARTY TRANSACTIONS:
Related party receivable and payable				$ 0.1
Amminco Apoyo and Ferrocarril Mexicano | Maximum
RELATED PARTY TRANSACTIONS:
Threshold revenue from related parties	$ 0.1
Boutique Bowling and Operadora De Cinemas | Maximum
RELATED PARTY TRANSACTIONS:
Total sales		$ 0.1

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