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RELATED PARTY TRANSACTIONS: (Details) MXN in Millions, $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	May 31, 2010 USD ($)	Dec. 31, 2014	Mar. 31, 2012 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2012 USD ($) MW	Dec. 31, 2005 item	Aug. 04, 2014 item	Mar. 31, 2012 MXN	Mar. 31, 2012 USD ($)
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				$ 23.4	$ 15.8
Related parties receivable non-current:					111.2
Related parties payable:				62.2	69.3
Compaia Perforadora Mexico S.A.P.I. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				1.3	0.7
Total purchases from related parties				0.3	0.3	$ 3.1
Sales revenues from related parties				0.6	0.6	0.6
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				5.5
Related parties payable:				36.3	20.6
Total purchases from related parties				30.3	32.0	47.9
Sales revenues from related parties				37.1	72.3	24.7
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:					0.2
Related parties payable:				3.0
Total purchases from related parties				42.7	27.3	22.7
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				4.5	0.6
Related parties payable:				0.1	12.0
Total purchases from related parties				13.8	13.8	13.9
Sales revenues from related parties				0.6	0.5
Mexico Generadora de Energia S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				10.2	13.9
Related parties receivable non-current:					111.2		$ 184.0
Related parties payable:				13.9	23.0
Total purchases from related parties				233.8	143.3	178.4
Sales revenues from related parties				95.9	81.7	96.5
Related party transactions number of power plants to be constructed \| item								2
Line of credit	$ 350.0
Interest rate (as a percent)	4.40%						5.75%
Percentage of supply to third-party energy users							12.00%
Loan repaid			$ 150.0
Interest earned				4.2	9.2	9.4
Mexico Generadora de Energia S. de R.L. ("MGE") \| Mexico
RELATED PARTY TRANSACTIONS:
Net total capacity (in megawatts) \| MW							516.2
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") \| Controladora de Infraestructura Energetica Mexico, S. A. de C. V.
RELATED PARTY TRANSACTIONS:
Ownership percentage										99.999%	99.999%
Value of interest acquired										MXN 1,928.6	$ 150.0
Operadora de Generadoras de Energia Mexico S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.1	0.1
Sales revenues from related parties				0.1
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.2
Related parties payable:				0.4	0.2
Total purchases from related parties				0.5	0.5
Total sales revenues from related parties				0.1	0.2
Boutique Bowling de Mexico S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.1
Related parties payable:				0.2	0.2
Total purchases from related parties				0.4	0.4
Total sales revenues from related parties				0.2	0.3
Breaker, S.A. de C.V and affiliates ("Breaker")
RELATED PARTY TRANSACTIONS:
Related parties payable:				0.3	0.3
Total purchases from related parties				0.5	5.5	10.1
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				1.5	0.3
Related parties payable:				7.8	11.8
Total purchases from related parties				76.0	57.3	61.4
Sales revenues from related parties				0.4	0.8	0.8
Grupo Mexico and Affiliates
RELATED PARTY TRANSACTIONS:
Total purchases from related parties				398.9	280.6	335.0
Total sales revenues from related parties				134.7	155.9	122.6
Eolica El Retiro, S.A.P.I de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:				0.1	0.1
Total purchases from related parties				2.0	6.6	7.6
Number of wind turbines \| item									37
Supply of power output to IMMSA (as a percent)		15.00%
Higher Technology S.A.C.
RELATED PARTY TRANSACTIONS:
Total purchases from related parties				1.0	1.4	3.2
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties payable:				0.1	0.5
Total purchases from related parties				2.0	2.0	2.5
Total sales revenues from related parties				0.2	0.3	0.3
Sempertrans and affiliates
RELATED PARTY TRANSACTIONS:
Related parties payable:					0.6
Total purchases from related parties					1.2	1.2
Companies with relationship to the controlling group
RELATED PARTY TRANSACTIONS:
Total purchases from related parties				2.9	2.9	2.5
Total sales revenues from related parties				0.5	0.8	0.3
Companies with relationship to SCC executive officers' families
RELATED PARTY TRANSACTIONS:
Total purchases from related parties				2.0	8.8	16.4
Servicios y Fabricaciones Mecanicas S.A.C.
RELATED PARTY TRANSACTIONS:
Total purchases from related parties				$ 0.5	$ 0.7	1.3
Pigoba S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Total purchases from related parties						$ 0.6
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage				44.20%