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RELATED PARTY TRANSACTIONS: (Details) MXN in Millions, $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 04, 2014 item	May 31, 2010 USD ($)	Sep. 30, 2017 USD ($)	Mar. 31, 2012 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2005 item	Dec. 31, 2016 USD ($)	Mar. 31, 2012 MXN	Mar. 31, 2012 USD ($)
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			$ 76.0		$ 76.0				$ 23.4
Related parties payable:			83.1		83.1				62.2
Grupo Mexico and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases					338.0	$ 295.0
Total sales					172.2	111.0
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			38.5		38.5				5.5
Related parties payable:			23.5		23.5				36.3
Total purchases					29.6	26.9
Total sales					94.1	37.0
Mexico Generadora de Energia S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			31.6		31.6				10.2
Related parties payable:			44.5		44.5				13.9
Total purchases					168.5	171.3
Total sales					77.8	72.6
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
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							14.00%
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%
Mexico Generadora de Energia S. de R.L. ("MGE") | Minera Mexico | Maximum
RELATED PARTY TRANSACTIONS:
Ownership percentage										0.001%	0.001%
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			2.8		2.8				4.5
Related parties payable:			0.7		0.7				0.1
Total purchases					10.5	15.0
Total sales					0.1	0.6
Donations			1.9
Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			1.4		1.4				1.3
Total sales					0.2	0.5
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			1.2		1.2				1.5
Related parties payable:			9.1		9.1				7.8
Total purchases					92.8	47.1
Total sales						0.3
Operadora de Generadoras de Energia Mexico S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:									0.1
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			4.1		4.1				3.0
Total purchases					34.2	33.9
Eolica El Retiro, S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			0.1		0.1				0.1
Total purchases					2.4	0.8
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					0.7	2.3
Total sales					0.6	0.7
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.3		0.3				0.2
Related parties payable:			0.6		0.6				0.4
Total purchases					0.1	0.5
Total sales					0.1	0.1
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties payable:			0.1		0.1				0.1
Total purchases					0.4	1.5
Total sales					0.3	0.4
Boutique Bowling de Mexico S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.2		0.2				0.1
Related parties payable:			$ 0.4		0.4				0.2
Total purchases					0.2	0.3
Total sales					0.2	0.2
Related to SCC executive officers
RELATED PARTY TRANSACTIONS:
Total purchases					0.2	2.0
Breaker, S.A. de C.V and affiliates ("Breaker")
RELATED PARTY TRANSACTIONS:
Related parties payable:									$ 0.3
Total purchases						0.5
Higher Technology S.A.C.
RELATED PARTY TRANSACTIONS:
Total purchases						1.0
Pigoba S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Total purchases						0.1
Servicios y Fabricaciones Mecanicas S.A.C.
RELATED PARTY TRANSACTIONS:
Total purchases					$ 0.2	$ 0.4
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage			44.20%		44.20%

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