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RELATED PARTY TRANSACTIONS: (Details) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	May 31, 2020 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Aug. 04, 2014 item
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		$ 46.5			$ 23.3
Related parties payable:		107.1			104.3
Total purchases		0.6	$ 2.1
Total sales		0.4	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		114.0	147.4
Total sales		44.8	15.7
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		8.0			5.3
Related parties payable:		19.6			13.9
Total purchases		3.7	62.5
Total sales		6.9	5.9
Accounts Receivable						$ 62.0
Making quarterly payments		$ 0.5
Interest earned			0.6
Asarco LLC | London Interbank Offered Rate (LIBOR) [Member]
RELATED PARTY TRANSACTIONS:
Debt Instrument, Basis Spread on Variable Rate		2.00%
Compania Perforadora Mexico, S.A.P.I. de C.V. and affiliates
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:					0.3
Total purchases		$ 0.2	$ 0.1
Number of wind turbines | item							37
Percentage of supply to third-party energy users		9.30%	9.60%
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:		$ 3.5			4.7
Total purchases		10.9	$ 12.0
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		2.7			2.7
Related parties payable:					0.9
Total purchases			2.5
Donations		0.5
Grupo Mexico Servicios
RELATED PARTY TRANSACTIONS:
Related parties payable:		4.7			19.6
Total purchases		7.1	4.4
Mexico Generadora de Energia, S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		34.7			14.4
Related parties payable:		62.0			40.8
Total purchases		77.7	51.6
Total sales		$ 37.9	$ 9.8
Accounts Receivable	$ 97.2
Making quarterly payments	$ 5.1
Debt Instrument, Basis Spread on Variable Rate	8.28%
Mexico Generadora de Energia, S. de R.L. ("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		2.70%	1.00%
Mexico Compania Constructora S.A de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:		$ 16.1			22.9
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates ("MPD")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.2			0.2
Related parties payable:		0.5			0.7
Mexico Proyectos y Desarrollos SA de CV and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases		$ 14.4	$ 14.3
Apu Coropuna S.R.L.
RELATED PARTY TRANSACTIONS:
Ownership percentage		30.00%
Boutique Bowling de Mexico, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		$ 0.2			0.2
Related parties payable:		0.4			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:		0.1			0.1
Total purchases		0.4	1.9
Total sales		0.4	0.4
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.2			0.2
Related parties payable:		0.2			$ 0.1
Total purchases		$ 0.1	$ 0.1
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage		44.20%

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