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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	3 Months Ended		12 Months Ended
RELATED PARTY TRANSACTIONS: (Details) $ in Millions	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2019 USD ($)	Aug. 04, 2014 item
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	$ 35.3			$ 30.0
Related parties receivable non-current:	59.0			59.5
Related parties payable:	81.6			86.4
Total purchases	2.1	$ 0.1
Total sales	0.4	0.6
Grupo Mexico and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases	147.4	92.3
Total sales	15.7	17.1
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	15.9			10.8
Related parties receivable non-current:	59.0			59.5
Related parties payable:	23.8			4.3
Total purchases	62.5	10.0
Total sales	5.9	2.0
Accounts Receivable	62.0
Making quarterly payments	0.5
Interest earned	0.6
Asarco LLC \| Other Noncurrent Assets [Member]
RELATED PARTY TRANSACTIONS:
Due from related parties, non-current	$ 59.0
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:	$ 9.1			16.9
Total purchases	4.4	2.4
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:	0.1
Total purchases	$ 0.1	$ 0.8
Number of wind turbines \| item					37
Percentage of supply to third-party energy users	3.00%	20.90%
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:	$ 6.1			6.4
Total purchases	12.0	$ 10.6
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	2.7			2.7
Related parties payable:	1.3			1.1
Total purchases	2.5	2.5
Donations	0.0	3.4
Mexico Generadora de Energia, S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	15.5			15.3
Related parties payable:	34.7			40.2
Total purchases	51.6	55.2
Total sales	9.8	$ 15.1
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		2.10%	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
Related parties payable:	6.1			16.0
Mexico Proyectos y Desarrollos SA de CV and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases	$ 14.3	$ 10.8
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:	$ 0.1			0.1
Related parties payable:	0.3			0.2
Total purchases	0.1	0.1
Empresarios Industriales de Mexico, S.A. de C.V
RELATED PARTY TRANSACTIONS:
Total sales		0.1
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	0.5			0.4
Related parties payable:				1.2
Total purchases	1.9
Total sales	0.4	$ 0.5
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:	0.1			0.1
Related parties payable:	0.1			$ 0.1
Total purchases	$ 0.1
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage	44.20%