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RELATED PARTY TRANSACTIONS: (Details) $ in Millions	1 Months Ended	9 Months Ended		12 Months Ended
	May 31, 2020 USD ($)	Sep. 30, 2021 USD ($) item	Sep. 30, 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:		$ 34.6			$ 23.3
Related parties payable:		112.7			104.3
Total purchases		1.4	$ 3.4
Total sales		1.4	1.4
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		337.9	482.4
Total sales		115.2	96.4
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		7.8			5.3
Related parties payable:		20.4			13.9
Total purchases		23.0	224.3
Total sales		22.8	58.6
Accounts Receivable						$ 62.0
Making quarterly payments		$ 0.5
Interest Income, Related Party			1.8
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:		5.9			0.3
Total purchases		$ 6.2	$ 0.8
Number of wind turbines | item							37
Percentage of supply to third-party energy users		61.00%	11.50%
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:		$ 3.5			4.7
Total purchases		33.1	$ 36.8
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		2.7			2.7
Related parties payable:					0.9
Total purchases			7.5
Donations		1.3	7.0
Grupo Mexico Servicios
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.1
Related parties payable:		16.7			19.6
Total purchases		21.9	13.4
Total sales		0.1	0.1
Intermodal Mexico S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Total purchases		0.5
Mexico Generadora de Energia, S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		23.3			14.4
Related parties payable:		50.6			40.8
Total purchases		209.0	157.2
Total sales		$ 92.3	$ 37.7
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%	2.60%
Mexico Compania Constructora S.A de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:		$ 14.1			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:		0.8			0.7
Mexico Proyectos y Desarrollos SA de CV and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases		43.8	$ 42.4
Peru Mining Exploration And Development Company
RELATED PARTY TRANSACTIONS:
Total purchases		$ 0.4
Number of mining concessions purchased | item		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
Related parties payable:		$ 0.3			0.3
Total purchases		0.2	0.3
Total sales			0.1
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.2
Related parties payable:		0.3			0.1
Total purchases		1.1	3.0
Total sales		1.4	1.2
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:					0.2
Related parties payable:		0.1			$ 0.1
Total purchases		0.1	0.1
Total sales			$ 0.1
Operadora de Cinemas S.A. de C.V. | Maximum
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.1
Total sales		$ 0.1
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage		44.20%

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