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RELATED PARTY TRANSACTIONS: (Details) MXN in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2012 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012	Dec. 31, 2005 item	Aug. 04, 2014 item	Mar. 31, 2012 MXN	Mar. 31, 2012 USD ($)	May. 31, 2010 USD ($)
Related party transactions
Related parties receivables current:		$ 15.8	$ 32.8
Related parties receivable non-current:		111.2	161.2
Related parties payables:		69.3	69.1
Grupo Mexico and Affiliates
Related party transactions
Total purchases from related parties		280.6	335.0	$ 206.4
Total sales revenues from related parties		155.9	122.6	117.4
Asarco LLC
Related party transactions
Related parties payables:		20.6	13.8
Total purchases from related parties		32.0	47.9	98.0
Sales revenues from related parties		72.3	24.7	88.7
Breaker, S.A. de C.V and affiliates ("Breaker")
Related party transactions
Related parties payables:		0.3	0.7
Total purchases from related parties		5.5	10.1	3.9
Eolica El Retiro, S.A.P.I de C.V.
Related party transactions
Related parties payables:		0.1	1.6
Total purchases from related parties		6.6	7.6
Number of wind turbines \| item							37
Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates
Related party transactions
Related parties receivables current:		0.7	0.2
Total purchases from related parties		0.3	3.1	6.1
Sales revenues from related parties		0.6	0.6	0.6
Ferrocarril Mexicano, S.A. de C.V.
Related party transactions
Related parties receivables current:		0.2
Related parties payables:			1.8
Total purchases from related parties		27.3	22.7	19.7
Grupo Mexico
Related party transactions
Related parties receivables current:		0.6	0.7
Related parties payables:		12.0	2.8
Total purchases from related parties		13.8	13.9	13.8
Sales revenues from related parties		0.5
Higher Technology S.A.C.
Related party transactions
Related parties payables:			0.2
Total purchases from related parties		1.4	3.2	2.2
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
Related party transactions
Related parties payables:		0.5	1.3
Total purchases from related parties		2.0	2.5	2.7
Total sales revenues from related parties		0.3	0.3	0.3
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
Related party transactions
Related parties receivables current:		0.3
Related parties payables:		11.8	1.7
Total purchases from related parties		57.3	61.4	54.4
Sales revenues from related parties		0.8	0.8	0.8
MGE
Related party transactions
Related parties receivables current:		13.9	31.9
Related parties receivable non-current:		111.2	161.2	184.0
Related parties payables:		23.0	45.2
Total purchases from related parties		143.3	178.4	14.4
Sales revenues from related parties		81.7	96.5	$ 27.3
Related party transactions number of power plants to be contructed \| item						2
Line of credit										$ 350.0
Interest rate (as a percent)				5.75%	4.40%
Loan repaid	$ 150.0
Interest earned		9.2	9.4	$ 9.9
MGE \| Maximum
Related party transactions
Ownership percentage								0.001%	0.001%
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	$ 112.0
Operadora de Generadoras de Energia Mexico S.A. de C.V.
Related party transactions
Related parties receivables current:		0.1
Sempertrans and affiliates
Related party transactions
Related parties payables:		0.6
Total purchases from related parties		1.2	1.2	1.1
Companies with relationship to the controlling group
Related party transactions
Total purchases from related parties		2.9	2.5	2.7
Total sales revenues from related parties		0.8	0.3	0.3
Companies with relationship to SCC executive officers' families
Related party transactions
Total purchases from related parties		8.8	16.4	7.9
Servicios y Fabricaciones Mecanicas S.A.C.
Related party transactions
Total purchases from related parties		$ 0.7	1.3	0.4
Pigoba S.A. de C.V.
Related party transactions
Total purchases from related parties			$ 0.6	$ 0.3
Equity investment in affiliate
Related party transactions
Ownership percentage		44.20%
Loan granted		$ 56.6
Boutique Bowling de Mexico S.A. de C.V.
Related party transactions
Related parties payables:		0.2
Total purchases from related parties		0.4
Total sales revenues from related parties		0.3
Operadora de Cinemas S.A. de C.V.
Related party transactions
Related parties payables:		0.2
Total purchases from related parties		0.5
Total sales revenues from related parties		$ 0.2