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The number of natural gas-fired combined cycle power generating units.

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RELATED PARTY TRANSACTIONS: (Details) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
RELATED PARTY TRANSACTIONS: (Details) $ in Millions	May 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2019 USD ($)	Aug. 04, 2014 item
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		$ 42.1	$ 42.1			$ 30.0
Related parties receivable non-current:		58.5	58.5			59.5
Related parties payable:		125.7	125.7			86.4
Total purchases			2.6	$ 1.0
Total sales			1.0	0.9
Grupo Mexico and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases			336.0	188.0
Total sales			32.2	27.7
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		21.9	21.9			10.8
Related parties receivable non-current:		58.5	58.5			59.5
Related parties payable:		46.2	46.2			4.3
Total purchases			168.4	19.8
Total sales			11.0	5.8
Accounts Receivable		62.0	62.0
Making quarterly payments			0.5
Interest earned			1.3
Asarco LLC \| Other Noncurrent Assets [Member]
RELATED PARTY TRANSACTIONS:
Due from related parties, non-current		58.5	$ 58.5
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:		13.0	$ 13.0			16.9
Total purchases			8.9	4.4
Compania Perforadora Mexico, S.A.P.I. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.3	0.3			0.3
Eolica El Retiro, S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:		0.3	0.3
Total purchases			$ 0.5	$ 2.0
Number of wind turbines \| item							37
Percentage of supply to third-party energy users			9.10%	27.80%
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.1	$ 0.1
Related parties payable:		7.0	7.0			6.4
Total purchases			22.2	$ 20.5
Total sales				0.1
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		2.7	2.7			2.7
Related parties payable:		0.9	0.9			1.1
Total purchases			5.0	5.0
Donations		3.0		4.8
Mexico Generadora de Energia, S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		15.8	15.8			15.3
Related parties payable:		40.0	40.0			40.2
Total purchases			105.2	100.7
Total sales			21.2	$ 21.8
Accounts Receivable	$ 97.2
Making quarterly payments	$ 4.2
Debt Instrument, Basis Spread on Variable Rate	8.28%
Due from related parties, non-current	$ 15.8
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				4.60%	1.00%
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates ("MPD")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.2	0.2			0.2
Related parties payable:		$ 17.6	17.6			16.0
Mexico Proyectos y Desarrollos SA de CV and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases			$ 25.8	$ 35.6
Apu Coropuna S.R.L.
RELATED PARTY TRANSACTIONS:
Ownership percentage		30.00%	30.00%
Boutique Bowling de Mexico, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		$ 0.1	$ 0.1			0.1
Related parties payable:		0.2	0.2			0.2
Total purchases			0.2	0.1
Total sales			0.1
Empresarios Industriales de Mexico, S.A. de C.V
RELATED PARTY TRANSACTIONS:
Total purchases				0.1
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.9	0.9			0.4
Related parties payable:		0.4	0.4			1.2
Total purchases			2.3	0.8
Total sales			0.8	$ 0.9
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.1	0.1			0.1
Related parties payable:		$ 0.1	0.1			$ 0.1
Total purchases			0.1
Total sales			$ 0.1
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage		44.20%	44.20%