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RELATED PARTY TRANSACTIONS: (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2012 item MW	Aug. 04, 2014 item
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	$ 29.9		$ 49.1
Related parties payable:	114.3		103.3
Total purchases	0.5	$ 0.6
Total sales	0.5	0.4
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	105.2	114.0
Total sales	45.9	44.8
Asarco LLC ("Asarco")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	7.0		10.0
Related parties payable:	29.6		14.9
Total purchases	14.6	3.7
Total sales	11.4	6.9
AMMINCO
RELATED PARTY TRANSACTIONS:
Related parties payable:	4.2		9.5
Total purchases	2.2	4.6
Americas Mining Corporation
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	0.1		0.1
Compania Perforadora Mexico S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	0.3		0.3
Eolica El Retiro, S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:	0.4		2.7
Total purchases	$ 0.9	$ 0.2
Number of wind turbines | item					37
Percentage of supply to third-party energy users	46.60%	9.30%
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:	$ 9.3		4.0
Total purchases	5.2	$ 10.9
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Donations	0.0	0.5
Grupo Mexico Servicios
RELATED PARTY TRANSACTIONS:
Related parties payable:	13.6		11.1
Total purchases	5.0	2.5
MGE
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	21.8		38.4
Related parties payable:	51.3		57.2
Total purchases	70.1	77.7
Total sales	$ 34.5	$ 37.9
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	0.20%	2.70%
Mexico Compania Constructora S.A de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:	$ 3.5		2.0
Total purchases	$ 5.1	$ 13.0
Apu Coropuna S.R.L.
RELATED PARTY TRANSACTIONS:
Ownership percentage	30.00%
Grupo Mexico Servicios de Ingenieria, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	$ 0.2		0.2
Related parties payable:	1.1		0.9
Total purchases	1.3	1.4
Controladora de Infraestructura Energetica Mexico, S. A. de C. V.
RELATED PARTY TRANSACTIONS:
Related parties payable:	0.9
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:	0.4
Related parties payable:	0.3		0.5
Total purchases	0.4	0.4
Total sales	0.5	0.4
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			0.2
Total purchases		$ 0.1
Operadora de Cinemas S.A. de C.V. | Maximum
RELATED PARTY TRANSACTIONS:
Related party receivable and payable	0.1		0.1
Total sales	$ 0.1		$ 0.1
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage	44.20%

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