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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, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2014 item
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			$ 23.3	$ 30.0	$ 101.5
Related parties receivable non-current:				59.5
Related parties payable:			104.3	86.4
Total purchases			4.1	2.9	12.9
Total sales			1.9	2.2	1.5
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			576.3	385.6	380.5
Total sales			132.9	58.9	150.3
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			5.3	10.8
Related parties receivable non-current:				59.5
Related parties payable:			13.9	4.3
Total purchases			233.9	37.6	37.2
Total sales			77.9	11.3	81.8
Accounts Receivable		$ 62.0
Making quarterly payments		$ 0.5
Asarco LLC | Other Noncurrent Assets [Member]
RELATED PARTY TRANSACTIONS:
Related parties receivable non-current:			2.2	2.3
Asarco LLC | London Interbank Offered Rate (LIBOR) [Member]
RELATED PARTY TRANSACTIONS:
Debt Instrument, Basis Spread on Variable Rate		2.00%
AMMINCO
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.1
Related parties payable:			19.6	16.9
Total purchases			18.6	17.8	8.0
Total sales			0.1	0.1	0.3
Compania Perforadora Mexico, S.A.P.I. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.3	0.3
Total sales				0.1
Eolica El Retiro, S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			0.3
Total purchases			$ 1.0	$ 2.9	3.6
Number of wind turbines | item							37
Percentage of supply to third-party energy users			9.60%	18.20%
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			$ 4.7	$ 6.4
Total purchases			45.8	44.1	41.7
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			2.7	2.7
Related parties payable:			0.9	1.1
Total purchases			10.0	10.0	10.1
Donations			7.1	9.6
Mexico Generadora de Energia, S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			14.4	15.3
Related parties payable:			40.8	40.2
Total purchases			213.3	202.2	200.1
Total sales			$ 54.9	$ 47.4	68.2
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			2.30%	5.20%
Mexico Compania Constructora S.A de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			$ 22.9	$ 16.0
Total purchases			42.6	60.3	72.9
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:			0.7
Total purchases			$ 11.1	10.7	6.9
Apu Coropuna S.R.L.
RELATED PARTY TRANSACTIONS:
Ownership percentage			30.00%
Related to the controlling group
RELATED PARTY TRANSACTIONS:
Total purchases			$ 0.2	0.2	0.2
Boutique Bowling de Mexico, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.2	0.1
Related parties payable:			0.3	0.2
Total purchases			0.4	0.4	0.3
Total sales			0.1	0.1	0.2
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 receivable current:				0.4
Related parties payable:			0.1	1.2
Total sales			1.7	1.8	1.2
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.2	0.1
Related parties payable:			0.1	0.1
Total purchases			3.5	2.3	12.4
Total sales			$ 0.1	$ 0.1	$ 0.1
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage			44.20%

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