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RELATED PARTY TRANSACTIONS: (Details) $ in Millions	1 Months Ended		12 Months Ended
	May 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2014 item
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			$ 49.1	$ 23.3
Related parties payable:			103.3	104.3
Total purchases			454.4	576.3	$ 385.6
Total sales			2.0	1.9	2.2
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			2.5	4.1	2.9
Total sales			160.5	132.9	58.9
Asarco LLC ("Asarco")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			10.0	5.3
Related parties payable:			14.9	13.9
Total purchases			31.3	233.9	37.6
Total sales			33.4	77.9	11.3
Accounts Receivable		$ 62.0
Making quarterly payments		$ 0.5
Asarco LLC ("Asarco") | Other Noncurrent Assets [Member]
RELATED PARTY TRANSACTIONS:
Related parties receivable			2.2	2.3
Asarco LLC ("Asarco") | London Interbank Offered Rate (LIBOR) [Member]
RELATED PARTY TRANSACTIONS:
Debt Instrument, Basis Spread on Variable Rate		2.00%
AMMINCO
RELATED PARTY TRANSACTIONS:
Related parties payable:			9.5	19.6
Total purchases			8.9	18.6	17.8
Total sales			0.1	0.1	0.1
Americas Mining Corporation
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.1
Total sales			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:			2.7	0.3
Total purchases			$ 9.3	$ 1.0	2.9
Number of wind turbines | item							37
Percentage of supply to third-party energy users			61.00%	9.60%
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			$ 4.0	$ 4.7
Total purchases			41.8	45.8	44.1
Total sales					0.1
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				2.7
Related parties payable:				0.9
Total purchases				10.0	10.0
Donations			0.9	7.1	9.6
Grupo Mexico Servicios
RELATED PARTY TRANSACTIONS:
Related parties payable:			11.1
Total purchases			20.1
Intermodal Mexico S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Total purchases			0.5
MGE
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			38.4	14.4
Related parties payable:			57.2	40.8
Total purchases			287.3	213.3	202.2
Total sales			$ 126.9	$ 54.9	47.4
Accounts Receivable	$ 97.2
Making quarterly payments	$ 5.1
Debt Instrument, Basis Spread on Variable Rate	8.28%
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			2.00%	2.30%
Mexico Compania Constructora S.A de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			$ 2.0	$ 22.9
Total purchases			44.5	42.6	60.3
Peru Mining Exploration And Development Company
RELATED PARTY TRANSACTIONS:
Total purchases			$ 0.4
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:			0.9	0.7
Total purchases			10.3	11.1	10.7
Companies with relationship to the controlling group
RELATED PARTY TRANSACTIONS:
Total purchases			0.4	0.2	0.2
Boutique Bowling de Mexico, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.1	0.2
Related parties payable:			0.3	0.3
Total purchases			0.3	0.4	0.4
Total sales			0.1	0.1	0.1
Empresarios Industriales de Mexico, S.A. de C.V
RELATED PARTY TRANSACTIONS:
Total sales					0.2
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties payable:			0.5	0.1
Total sales			1.8	1.7	1.8
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.2
Related parties payable:			0.2	0.1
Total purchases			1.8	3.5	2.3
Total sales			0.1	$ 0.1	$ 0.1
Operadora de Cinemas S.A. de C.V. | Maximum
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			$ 0.1
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage			44.20%

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