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RELATED PARTY TRANSACTIONS: (Details) $ in Millions, $ in Millions		1 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended
	Aug. 04, 2014 item	May 31, 2010 USD ($)	Mar. 31, 2012 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2005 item	Dec. 31, 2017 USD ($)	Mar. 31, 2012 MXN ($)	Mar. 31, 2012 USD ($)
RELATED PARTY TRANSACTIONS:
Related parties receivable:				$ 90.7				$ 26.1
Related parties payable:				79.5				90.1
Grupo Mexico and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases				286.2	$ 338.0
Total sales				135.1	172.2
Mexico Generadora de Energia, S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable:				11.1				16.2
Related parties payable:				37.3				38.5
Total purchases				144.4	168.5
Total sales				52.3	$ 77.8
Maximum amount of line of credit granted to related party		$ 350.0
Interest rate (as a percent)		4.40%
Loan repaid			$ 150.0
Mexico Generadora de Energia, S. de R.L. ("MGE") | Mexico
RELATED PARTY TRANSACTIONS:
Number of power plants | item						2	2
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					14.00%	22.00%
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									$ 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%
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable:				74.1				4.1
Related parties payable:				10.4				24.2
Total purchases				30.0	$ 29.6
Total sales				82.8	94.1
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable:				2.7				2.8
Related parties payable:				7.0				0.7
Total purchases				13.5	10.5
Total sales					0.1
Donations				5.5
Compania Perforadora Mexico, S.A.P.I. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable:				1.4				1.4
Total sales					0.2
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable:				0.5				1.1
Related parties payable:				16.2				21.7
Total purchases				63.1	92.8
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:				7.0				2.6
Total purchases				33.0	34.2
Eolica El Retiro, S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:				0.9				0.8
Total purchases				2.2	$ 2.4
Number of wind turbines | item	37
Percentage of supply to third-party energy users	17.00%				27.00%
Related to the controlling group
RELATED PARTY TRANSACTIONS:
Total purchases				1.4	$ 0.7
Total sales				1.5	0.6
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties receivable:				0.2
Related parties payable:				0.3				0.3
Total purchases				1.1	0.4
Total sales				1.2	0.3
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable:				0.4				0.3
Related parties payable:				0.2				0.7
Total purchases				0.1	0.1
Total sales				0.1	0.1
Boutique Bowling de Mexico, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable:				0.3				0.2
Related parties payable:				0.2				$ 0.6
Total purchases				0.2	0.2
Total sales				$ 0.2	$ 0.2
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage				44.20%

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