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RELATED PARTY TRANSACTIONS: (Details) MXN in Millions, $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 04, 2014 item	May 31, 2010 USD ($)	Mar. 31, 2012 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2005 item	Mar. 31, 2012 MXN	Mar. 31, 2012 USD ($)
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				$ 26.1	$ 23.4
Related parties payable:				$ 90.1	62.2
Ownership percentage				0.71%
Grupo Mexico and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases				$ 474.6	398.9	$ 280.6
Total sales				197.6	134.7	155.9
Mexico Generadora de Energia S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				16.2	10.2
Related parties payable:				38.5	13.9
Total purchases				223.7	233.8	143.3
Total sales				101.0	95.9	81.7
Maximum amount of line of credit granted to related party		$ 350.0
Interest rate (as a percent)		4.40%
Loan repaid			$ 150.0
Interest earned					4.2	9.2
Mexico Generadora de Energia S. de R.L. ("MGE") | Maximum
RELATED PARTY TRANSACTIONS:
Ownership percentage									0.001%	0.001%
Mexico Generadora de Energia S. de R.L. ("MGE") | Mexico
RELATED PARTY TRANSACTIONS:
Number of power plants | item							2	2
Net total capacity (in megawatts) | MW							516.2
Percentage of supply to third-party energy users							13.50%
Mexico Generadora de Energia S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V.
RELATED PARTY TRANSACTIONS:
Percentage of interest acquired									99.999%	99.999%
Value of interest acquired									MXN 1,928.6	$ 150.0
Mexico Generadora de Energia S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V. | Mexico
RELATED PARTY TRANSACTIONS:
Percentage of interest acquired							99.999%
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				4.1	5.5
Related parties payable:				24.2	36.3
Total purchases				37.2	30.3	32.0
Total sales				96.2	37.1	72.3
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				2.8	4.5
Related parties payable:				0.7	0.1
Total purchases				14.0	13.8	13.8
Total sales				0.2	0.6	0.5
Donations				1.9
Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				1.4	1.3
Total purchases					0.3	0.3
Total sales				0.2	0.6	0.6
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				1.1	1.5
Related parties payable:				21.7	7.8
Total purchases				152.9	76.0	57.3
Total sales					0.4	0.8
Operadora de Generadoras de Energia Mexico S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:					0.1
Total sales					0.1
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:				2.6	3.0
Total purchases				43.5	42.7	27.3
Eolica El Retiro, S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:				0.8	0.1
Total purchases				3.3	2.0	6.6
Number of wind turbines | item	37
Percentage of supply to third-party energy users	27.00%
Related to the controlling group
RELATED PARTY TRANSACTIONS:
Total purchases				1.7	2.9	2.9
Total sales				0.7	0.5	0.8
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.3	0.2
Related parties payable:				0.7	0.4
Total purchases				0.1	0.5	0.5
Total sales				0.2	0.1	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:				0.6	0.2
Total purchases				0.3	0.4	0.4
Total sales				0.2	0.2	0.3
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties payable:				0.3	0.1
Total purchases				1.3	2.0	2.0
Total sales				0.3	0.2	0.3
Related to SCC executive officers
RELATED PARTY TRANSACTIONS:
Total purchases				0.2	2.0	8.8
Breaker, S.A. de C.V and affiliates ("Breaker")
RELATED PARTY TRANSACTIONS:
Related parties payable:					0.3
Total purchases					0.5	5.5
Higher Technology S.A.C.
RELATED PARTY TRANSACTIONS:
Total purchases					1.0	1.4
Servicios y Fabricaciones Mecanicas S.A.C.
RELATED PARTY TRANSACTIONS:
Total purchases				$ 0.2	$ 0.5	0.7
Sempertrans and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases						$ 1.2
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage				44.20%

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